K&N MAF Sensor Test Results - January 2004 through June 2014

K&N has millions of satisfied customers, yet we do occasionally get instances where a dealership or service provider has blamed our product for a vehicle problem. We attempt to resolve these misunderstandings by speaking directly to the service technicians.  In any event, we take care of the consumer through our Consumer Protection Pledge.  In issues regarding MAF sensors, we have been able to recover many of the allegedly “bad” sensors and test them to diagnose the actual cause of the failure.  In most of these cases the "bad" sensor was actually functioning properly and was misdiagnosed by the dealership or service provider.  The diagram below is a summary of our findings.

Of the 126 sensors we received that were truly malfunctioning, 46 had a complete electronic failure in which the sensor's voltage output was a flat line, generally caused by a connection or circuitry problem within the sensor.  When a sensor is responsive but it's voltage output is not within the normal limits we refer to this as "out of range".  This condition can be caused by circuitry problems and it can also be caused by a sensor's thermistor becoming dirty or contaminated.  We sent 32 out of range sensors to an independent laboratory for an elemental and chemical analysis and the majority of them were found to have silicone as the contaminant.

Silicone is used on the circuitry of these sensors because it acts as an excellent thermal and electrical insulator, inherently sticks to most surfaces, and is resistant to moisture and heat.  Some MAF sensors use a high temperature burn-off cycle to eliminate normal engine contaminants from the sensor.  Silicone is resistant to this process.

Thermistors are used in MAF sensors to measure the transfer of heat from the thermistor to the air passing by the sensor.  A thermistor's resistance changes as its surrounding temperature changes. The greater the air mass and air flow the greater the transfer of heat.  When a thermistor is "silicone contaminated" the thermistor becomes insulated and can result in an out of range condition.

In addition to out of range sensors, functioning and failed sensors have also been sent to an independent forensic laboratory for analysis.  A few of these sensors were found to have trace amounts of oil on the thermistor.  The amount of oil was so minimal that an accurate analysis of the oil's source could not be determined.  The trace amount of oil can conceivably be found from two possible sources: fuel in the combustion chamber or motor oil used as an engine lubricant that gets suspended in crankcase vapor.  Our experience in the lab is that trace amounts of oil don't change the sensitivity of the sensor enough to cause an "out of range" electronic signal.  Furthermore our testing has shown that K&N air filter oil will not come off a K&N air filter even in extreme conditions.  More on this topic here.

As of the date of our last test shown below, K&N air filter oil cannot be confirmed as the source of contamination on a sensor nor can any oil type be attributed to a sensor’s failure.

MORE DETAILS ON SILICONE & TESTING

Mass Air Flow Sensor Electronic Testing at K&N:

The MAF sensor is placed on a test bench designed and built by K&N Engineering.  The test bench can flow air through the sensor at variable flow rates, ranging from idle to full throttle.  The flow of a sensor is then compared to a new sensor.

 

MAF Sensor Test Bench


Example of Sensor reading Normal

Example of Sensor reading Out of Range


Example of Failed Sensor (flat line)


Microscopic Examination:
When a service technician looks at a MAF sensor's thermistor what they see with their naked eye is very little.  It is nearly impossible to determine if a MAF sensor's thermistor  is dirty or clean from looking at it without magnification and good lighting.  When K&N views a MAF sensor, we look at it under a microscope.  Below are sample images under microscopic view.

 

Example of Clean Thermistor

Example of a Contaminated Thermistor

 

A MAF sensor is located under the hood of your vehicle and is subject to a heat, cold, vibration, etc., in other words, a hostile environment.  An engine performing as expected can contribute to contaminating a MAF sensor. The presence of gas fumes, a vehicle backfiring, combustion blow-by and even water condensation can contribute to contamination of a sensor. Ironically, the presence of contamination does not necessarily conclude the sensor is not functioning properly and requires replacement.


Independent Forensic Analysis:
An elemental and chemical analysis of the contamination has more often than not shown to be silicone.  K&N filter oil does not contain silicone.  The silicone can actually be traced to the sensor’s housing of the electronic circuitry. The silicone can seep out of the housing area onto the sensor.

 

MAF sensor thermistor probes connect to the circuit board.  Silicone covers the circuit electronics and it can seep down contaminating the thermistor.  This photo shows the silicone compound referenced, covering/protecting the electronics. The probes leading to the thermistor are connected to the underside of this circuit board.
 

This photo shows a probe demonstrating the stickiness of the silicone material.
 

This photo shows a sensor with silicone covering the electronics.  Note the small gold processor in center.
 

This photo is a close up of the processor under the silicone.
 

This photo is an extreme magnification of the processor. As can be seen, this is a complex sensor with thousands of connections and components all of which must be intact for the sensor to function properly.
 

Below is a more detailed summary of our actual test results.

 
  Quantity Initial Sensor Test Electronic Test Result Microscopic Examination Independent Laboratory Chemical Analysis Probable Cause
Electrical
Conduction
Failure
within Sensors
20 Bad Failure Clean N/A Electrical Failure
11 Bad Failure Dirty N/A Electrical Failure
5 Bad Failure Dirty Silicone Electrical Failure
1 Bad Failure Dirty Trace Oil Electrical Failure
1 Bad Failure Dirty Silicone & Trace Oil Electrical Failure
8 Bad Failure De-lamination N/A Manufacturing Defect
26 Bad Out of Range Clean N/A Electrical Failure
22 Bad Out of Range Dirty N/A Electrical Failure
30 Bad Out of Range Dirty Silicone Electrical Failure
1 Bad Out of Range Dirty Silicone & Trace Oil Electrical Failure
1 Bad N/A Dirty Silicone Severe Silicone Leak
126 BAD  
Normally
Functioning
Sensors *
168 Good Normal Clean N/A Sensor Never Failed
65 Good Normal Dirty N/A Sensor Never Failed
2 Good Normal Dirty Dirt Sensor Never Failed
30 Good Normal Dirty Silicone Sensor Never Failed
3 Good Normal Dirty Trace Oil Sensor Never Failed
3 Good Normal Dirty Trace Oil & Silicone Sensor Never Failed
271 GOOD  
 

Electrical Failure: Electrical issue within sensor compared to a new sensor's specifications
Manufacturing Defect: A layer of the membrane sensor peels back causing electrical failure - known as de-lamination
Sensor Never Failed:  Service provider error; sensor was not malfunctioning
Severe Silicone Leak:  The silicone leak was too severe to run on the test stand

* Well over 50% of the "damaged" sensors sent to us were functioning properly meaning they were never damaged in the first place and cannot be attributed to any vehicle problem.  Click here for more information on how this may happen.

Below is the list of MAF sensors that were sent to K&N for testing.  The list includes dealerships that misdiagnosed the problem and blamed a K&N product for the failure.  Test results are also shown.

 
Dealership Date Vehicle Initial Sensor Test Electronic Test Results Microscopic Examination Indep. Lab Chem Analysis
Auburn Toyota, Auburn, CA 01/12/04 Toyota Good Normal Dirty N/A
Precision Toyota of Tucson, AZ 01/19/04 Toyota Good Normal Clean N/A
Power Toyota Irvine, CA 01/20/04 Toyota Good Normal Dirty N/A
Rolling Hills Ford, Clearmont, FL 01/22/04 Ford Bad Out of Range Dirty N/A
Precision Toyota of Tucson, AZ 02/10/04 Toyota Good Normal Dirty N/A
Foley-Sweitzer Ford, Benton, IL 02/12/04 Ford Good Normal Dirty N/A
Mossy Toyota, San Diego, CA 02/15/04 Toyota Bad Out of Range Dirty Silicone
Scottsdale Nissan, Scottsdale, AZ 03/09/04 Nissan Bad Failure Clean N/A
Sullivan Brothers Nissan, Kingston, MA 03/31/04 Nissan Good Normal Clean N/A
Thousand Oaks Toyota, Thousand Oaks, CA 04/01/04 Toyota Bad Out of Range Dirty N/A
The Beetle Clinic, San Mateo, CA 04/28/04 VW Good Normal Clean N/A
Beach Ford, Myrtle Beach, FL 06/03/04 Ford Bad Out of Range Dirty N/A
Daub Ford L-M, Nazareth, PA 07/01/04 Ford Bad N/A Dirty Silicone
Classic Chevy, Mentor, OH 07/15/04 Chevy Good Normal Dirty N/A
Jim Click Automotive, Tucson, AZ 08/02/04 Nissan Bad Out of Range Clean N/A
Betley Chevy-Buick, Derry, NH 08/18/04 Chevy Bad Failure Dirty N/A
Fiore VW, West Warwick, RI 08/25/04 VW Bad Out of Range Dirty N/A
Bernard Chevy, Libertyville, IL 10/11/04 Isuzu Bad Failure Dirty N/A
White Bear Lake Pontiac-GMC, White Bear Lake, MN 10/11/04 GMC Good Normal Clean N/A
Don Davis Pontiac-GMC-Honda, Amhurst, NY 10/18/04 GMC Bad Failure Dirty N/A
Bay Chevy, Mobile, AL 11/05/04 Chevy Good Normal Dirty N/A
Heartland Chevy, Booneville, IN 11/19/04 Chevy Bad Failure Dirty N/A
Russ Dean Ford, Pasco, WA 12/23/04 Ford Good Normal Dirty N/A
El Cajon Ford, El Cajon, CA 01/07/05 Ford Good Normal Dirty N/A
Three Way Chevy, Bakersfield, CA 01/14/05 Chevy Good Normal Clean N/A
Tyrrell-Doyle Auto Center, Cheyenne, WY 02/03/05 Chevy Good Normal Clean N/A
Diamond Chevy, Charlotte, NC 03/08/05 Chevy Bad Failure Clean N/A
Paso Robles Ford, Paso Robles, CA 03/16/05 Ford Good Normal Dirty N/A
Peak Nissan, Littleton, CO 04/10/05 Nissan Good Normal Dirty N/A
Mossy Nissan, El Cajon, CA 05/05/05 Nissan Bad Out of Range Dirty Silicone
Antelope Valley Volkswagen, Palmdale, CA 05/12/05 VW Bad Out of Range Dirty Silicone
Bob Boyd Lincoln-Mercury, Columbus, OH 05/2013/05 Ford Good Normal Clean N/A
Toyota Carlsbad, Oceanside, CA 06/03/05 Toyota Good Normal Dirty Silicone
Stevens Creek Lexus, Santa Clara, CA   06/30/05 Lexus Good Normal Dirty Silicone
Chapman Auto Center, Payson, AZ 07/01/05 Chevy Good Normal Clean N/A
Shehadi Motors Inc., South Lake Tahoe, CA 08/01/05 Toyota Good Normal Dirty Silicone
Peak Nissan, Littleton, CO 08/12/05 Nissan Bad Failure Clean N/A
All Star Pontiac, Sulphur, LA 09/19/05 Pontiac Good Normal Clean N/A
Courtesy Chevy, Phoenix, AZ 09/19/05 Chevy Good Normal Dirty N/A
North County Jeep-GMC, Escondido, CA 09/19/05 GMC Good Normal Dirty N/A
Prewitts Auto Clinic, Oxford, MS 09/28/05 VW Bad Out of Range Dirty N/A
Boose Chevy, Brookville, OH 10/2013/05 Chevy Good Normal Dirty N/A
Jim Keil Chevy, Grass Valley, CA 10/31/05 Chevy Good Normal Clean N/A
Nobles Tire City, Baldwinsville, NY 11/22/05 Nissan Bad Failure Clean N/A
Jim Keil Chevy, Grass Valley, CA 11/30/05 Chevy Bad Failure Dirty Silicone
Joe Holland Service Center, S. Charleston, WV 11/30/05 Chevy Bad Failure Dirty N/A
Bill Heart Chevy, Las Vegas, NV 01/27/06 Chevy Good Normal Clean N/A
Sunnyside Toyota, North Olmstead, OH 02/28/06 Toyota Bad Out of Range Dirty Silicone
Moran, Fort Gratiot, MI 03/16/06 Cadillac Bad Failure Clean N/A
Owen Sound Hyundai, Owen Sound, ON 03/20/06 Hyundai Bad Failure Clean N/A
Blue Grass Automotive, Lousiville, KY 03/28/06 Hyundai Good Normal Dirty Silicone
DeCormier Motor Sales, Manchester, CT 03/28/06 Nissan Good Normal Dirty Silicone
Hillcrest Ford, Huntsville, TX 03/28/06 Ford Good Normal Dirty Silicone
Sierra Toyota, Lancaster, CA 03/29/06 Toyota Bad Failure Dirty N/A
Parkway, Valencia, CA 04/10/06 GMC Good Normal Clean N/A
Preston Ford, Preston, MD 04/12/06 Ford Good Normal Dirty N/A
Community Chevy, Burbank, CA 04/20/06 Chevy Good Normal Clean N/A
Mercedes-Benz of Laguna Niguel, Laguna Niguel, CA 04/24/06 Mercedes Bad Out of Range Dirty Silicone
Phillips Ford Sales, Manheim, PA 04/24/06 Ford Good Normal Dirty N/A
Tobias' Automotive Specialists, Inc., Anthem, AZ 04/27/06 Porsche Bad Out of Range Clean N/A
Jay Chevy, Highland, MI 05/02/06 Chevy Bad Out of Range Dirty Silicone
Northland VW, Calgary, AB 05/02/06 VW Good Normal Dirty Silicone
Visalia Toyota, Visalia, CA 05/02/06 Toyota Bad Out of Range Dirty Silicone
Lordco, Coquitlam, BC 05/11/06 Ford Good Normal Clean N/A
Strong Volkswagen, Salt Lake City, UT 05/30/06 VW Good Normal Clean N/A
The BMW Store, Cincinnati, OH 06/27/06 BMW Good Normal Clean N/A
Pro Auto Care, Tampa, FL 06/29/06 Nissan Bad Failure De-lamination N/A
Lynch Ford, Mt. Vernon, IA 06/30/06 Ford Bad Out of Range Dirty Silicone
Courtesy Chevy, Phoenix, AZ 07/06/06 Chevy Good Normal Clean N/A
Brien Ford, Inc., Everett, WA 07/18/06 Ford Good Normal Dirty Silicone
Hammonasett Ford, Madison, CT 07/21/06 Ford Good Normal Clean N/A
Power Chevy Arrowhead, Peoria, AZ 07/25/06 Chevy Good Normal Clean N/A
J.C. Billion, Bozeman, MT 07/26/06 Nissan Bad Failure Clean N/A
Lexus of Valencia, CA 07/28/06 Lexus Bad Out of Range Dirty Silicone
Sterling Auto, Manchester, NH 07/28/06 Toyota Bad Out of Range Dirty Silicone
TNT, Oceanside, CA 07/28/06 Toyota Bad Out of Range Dirty Silicone
Courtesy Chevy, Thousand Oaks, CA 08/01/06 Chevy Good Normal Clean N/A
Grubbs Nissan, Bedford, TX 08/02/06 Nissan Good Normal Clean N/A
MedVed Auto Parts, Castle Rock, CO 08/02/06 GMC Good Normal Clean N/A
Brad Francis Ford Mercury, Las Lunas, NM 08/04/06 Ford Good Normal Clean N/A
Fitzgerald Toyota, Gaithersburg, MD 08/04/06 Toyota Good Normal Clean N/A
Folsum Lake Toyota, Folsum, CA 08/14/06 Toyota Bad Out of Range Dirty Silicone
Universal Ford, Glen Allen, VA 08/24/06 Ford Good Normal Clean N/A
Nissian Turnersville, Turnersville, NJ 08/29/06 Nissan Bad Out of Range Clean N/A
Speed Tuning, Spencerville, MD 08/29/06 Mercedes Bad Out of Range Clean N/A
Konner Chevy, West Coldwell, NJ 08/30/06 Chevy Good Normal Clean N/A
Duke & Bobs, Kansas City, MO 09/12/06 Land Rover Good Normal Dirty Silicone
Andy Mohr Nissan, Indianapolis, IN 09/2013/06 Nissan Good Normal Dirty N/A
Ganley Akron, Inc., Akron, OH 09/2013/06 Toyota Bad Out of Range Dirty Silicone
City Chevy, San Diego, CA 09/16/06 Chevy Good Normal Clean N/A
Land Rover Winnetka, Winnetka, Il 10/04/06 Land Rover Good Normal Dirty Silicone
Chapman Porsche, Tuscon, AZ 10/05/06 Porsche Bad Failure Clean N/A
Mitchell Mazda Lincoln Mercury, Enterprise, AL 10/05/06 Ford Good Normal Clean N/A
Roger Chevy, Woodhaven, MI 10/10/06 Chevy Bad Failure Dirty Trace Oil
Capitol Hyundai, Columbia, SC 10/19/06 Hyundai Good Normal Dirty Trace Oil
Pioneer Centres, San Diego, CA 10/23/06 Porsche Bad Failure Clean N/A
Vaughn Auto, Ottumwa, IA 11/01/06 Chevy Good Normal Clean N/A
Midwestern BMW, Dublin, OH 11/09/06 BMW Good Normal Clean N/A
Country Ford, Levittown, NY 11/21/06 Ford Good Normal Dirty Silicone
Michael Automotive Chevy, Fresno, CA 11/28/06 Chevy Bad Out of Range Dirty Silicone
Vallejo German Car Clinic, Vallejo, CA 11/28/06 VW Good Normal Clean N/A
Ramey Ford, Beckley, WV 12/01/06 Ford Good Normal Clean N/A
Michael Chevy, Fresno, CA 12/07/06 Chevy Good Normal Dirty Trace Oil & Silicone
Vogler Motor Co. Inc., Carbondale, IL 12/2013/06 Ford Good Normal Clean N/A
Adams GMC, Annapolis, MD 12/2013/06 Chevy Good Normal Dirty Trace Oil & Silicone
Robbins Toyota, Texarkana, TX 12/18/06 Toyota Bad Out of Range Dirty Silicone
Smith South Plains, Levelland, TX 12/22/06 Ford Good Normal Dirty N/A
Gauden Porsche, Las Vegas, NV 01/03/07 Porsche Good Normal Dirty Silicone
Smith South Plains, Levelland, TX 01/11/07 Ford Good Normal Dirty Dirt
Lubbers, Cheney, KS 01/12/07 Chevy Good Normal Clean N/A
Elias Import Repair, Forest Lake, MN 01/17/07 Nissan Bad Out of Range Dirty Silicone
Falls GM, Little Falls, MN 01/19/07 Chevy Good Normal Dirty Silicone
Wright Automotive, Wexford, PA 01/22/07 Pontiac Bad Failure Clean N/A
Senator Mazda/Hyundai/Subaru, Sacramento, CA 01/30/07 Subaru Bad Out of Range Dirty Silicone
Findlay Motor Co., Bullhead City, AZ 01/31/07 GMC Good Normal Dirty N/A
Radley Automotive Group, Fredricksburg, VA 02/01/07 GMC Good Normal Clean N/A
Titus-Will Toyota, Tacoma, WA 02/06/07 Toyota Good Normal Dirty N/A
Saturn of Aurora, Aurora, CO 02/08/07 Saturn Good Normal Clean N/A
Land Rover of Tulsa, Tulsa, OK 02/2013/07 Land Rover  Bad Failure De-lamination N/A
Edmonton Motors, Edmonton, AB Canada 02/2013/07 Chevy Bad Failure Clean N/A
Douglas Nissan, Henderson, NV 02/19/07 Nissan Good Normal Clean N/A
Ed Voyles Hyundai, Smyrna, GA 02/23/07 Hyundai Good Normal Clean N/A
Lia Infiniti, Legham, CA 02/23/07 Infiniti Good Normal Clean N/A
Century Automotive Group, Huntsville, AL 03/06/07 BMW Bad Failure Clean N/A
Toyota of Iowa City Inc., Iowa City, IA 03/09/07 Toyota Good Normal Dirty N/A
Crown Toyota, Ontario, CA 03/12/07 Toyota  Bad Failure Dirty N/A
Capital Ford, Raleygh, NC 03/30/07 Ford Good Normal Clean N/A
Tustin Toyota, Tuscin, CA 04/11/07 Toyota  Good Normal Dirty Dirt
Power Toyota Irvine, Irvine, CA 04/12/07 Toyota Good Normal Dirty N/A
Mercedes of Greensboro, Greensboro, NC 04/18/07 Mercedes Good Normal Clean N/A
Town & Country Ford, Madison, TN 04/24/07 Ford Good Normal Clean N/A
Raceway Ford, Riverside, CA 04/26/07 Ford Good Normal Dirty N/A
Shawnee Service Center, Wilmette, IL 05/09/07 Ford  Bad Failure Dirty N/A
Steven's Chevu-Buick, Oakdale, CA 05/09/07 GMC Good Normal Clean N/A
Barrier, LLC, Bellevue, WA 05/09/07 Audi Bad Out of Range Clean N/A
Swiss Motors, Culver City, CA 05/09/07 BMW Bad Out of Range Dirty Silicone
Palm Springs Motors, Inc., Cathedral City, CA 05/16/07 Ford Good Normal Dirty N/A
Land Rover Minneapolis, Golden Valley, MN 05/21/07 Land Rover  Bad Out of Range Clean N/A
Findley Motor Company, Bullhead City, AZ 05/21/07 Chevy  Good Normal Dirty Silicone
Sparacio, Redding, CA 06/04/07 GMC Good Normal Clean N/A
McCroskey, Choctaw, OK 06/05/07 Chevy  Bad Out of Range Clean N/A
Hubler Chevy, Shelbyville, IN 06/15/07 Chevy  Good Normal Dirty N/A
Mike Savoie Chevy, Troy, MI 06/18/07 Chevy  Bad Out of Range Clean N/A
Firestone In Carlsbad, Carlsbad, CA 06/22/07 Nissan Bad Failure Clean N/A
Lithia Ford, Fresno, CA 07/06/07 Ford Good Normal Clean N/A
Rusnak/Pasadena, Pasadena, CA 07/06/07 Porsche  Bad Out of Range Dirty Silicone
Madison Auto Service, Lakewood, OH 07/09/07 Infinity Bad Failure Dirty Silicone
Randolphs Body Shop, Burnsville, NC 07/2013/07 Toyota Good Normal Dirty N/A
Keith Hawthorne, Morganton, NC 08/03/07 Chevy  Bad Out of Range Clean N/A
A1 Automotive, Yreka, CA 08/06/07 Volkswagon Good Normal Clean N/A
Wilson Ford, Fairmont, WV 08/08/07 Ford Good Normal Clean N/A
Go Ford West, Weathridge, CO 08/10/07 Ford Bad Out of Range Clean N/A
Parkway Hyundai, Valencia, CA 08/14/07 Hyundai Good Normal Clean N/A
Hemburg Ford, Norco, CA 08/21/07 Ford Good Normal Clean N/A
Automotive Solutions, Ogallala, NE 08/22/07 Chevy Bad Out of Range Clean N/A
Power Chevy Arrowhead, Peoria, AZ 08/22/07 Chevy Good Normal clean N/A
Maita Ford, Auburn, CA 08/28/07 Ford Good Normal Dirty N/A
BMW of Bayside, Bayside, NY 08/31/07 BMW Bad Out of Range Dirty Silicone
Fuerst Automotive, Broadview Heights, OH 09/05/07 Volkswagon Good Normal Dirty Silicone
Crossroads Ford, Frankfort, KY 09/06/07 Ford Good Normal Clean N/A
Long Beach Toyota, Long Beach, CA 09/14/07 Toyota Good Normal Clean N/A
Hall Automotive, Virginia Beach, VA 09/14/07 Pontiac Good Normal Clean N/A
Kitahara GMC, Fresno, CA 09/24/07 GMC Bad Out of Range Clean N/A
Power Chevy, Peoria, AZ 09/25/07 Chevy Good Normal Dirty Plastic
Walser Nissan, Burnsville, MN 09/25/07 Nissan Good Normal Dirty Silicone
Saturn Ontario, Ontario, CA? 09/27/07 Saturn Bad Out of Range Dirty Silicone
Cruse Motors of Worthington, Worthington, MN 09/27/07 Chevy Good Normal Clean N/A
Chevy of Turnersville, Turnersville, NJ 10/05/07 Chevy Good Normal Clean N/A
Crest Cadillac, Plano, TX 10/10/07 Cadillac Bad Out of Range Clean N/A
Cherner Lincoln Mercury, Vienna, VA 10/22/07 Kia Good Normal Clean N/A
Harbor Chevy, Long Beach, CA 10/23/07 Chevy Good Normal Dirty N/A
Bitterroot Motor, Missoula, MT 10/23/07 Scion Good Normal Clean N/A
Automotive Plus, Redding, CA? 10/24/07 Chevy Good Normal Clean N/A
Neighbors GMC/Pontiac, Costa Mesa, CA 10/31/07 GMC Bad Out of Range Dirty N/A
Motor City GMC, Bakersfield, CA 11/12/07 Chevy Good Normal Clean N/A
Phill Long Ford, Denver, CO 11/2013/07 Ford Good Normal Dirty N/A
Alex Ailliamson Motor Sales, Uxbridge, ON 11/20/07 GMC Bad Out of Range Dirty Silicone
Reliance Car Care, Marietta, GA 11/20/07 Mercedes Good Normal Dirty Silicone
O'Donald Chevy, San Gabrial, CA 11/20/07 Chevy Bad Out of Range Clean N/A
West Broad Audi, Richmond, VA 12/03/07 Audi Good Normal Dirty Silicone
Abeloff Nissan, Mont Pocono, PA 12/10/07 Nissan Good Normal Clean N/A
Banbury Porsche, Banbury, CT 12/10/07 Porsche Good Normal Dirty Silicone
Courtesy Chevy, Merced, CA 12/20/07 Chevy Bad Out of Range Clean N/A
Cascade Honda Chevy, Klamath Falls, OR 01/03/08 Chevy Bad Out of Range Clean N/A
Avondale Nissan, Avondale, AZ 01/07/08 Nissan Good Normal Dirty Silicone
Sanger Ford/Mercury, Sanger, CA 01/09/08 Ford Good Normal Dirty Silicone
Toyota of Huntington Beach, Huntington Beach, CA 01/11/08 Toyota Good Normal Clean N/A
Midway Chevy, Phoenix, AZ 01/14/08 Chevy Good Normal Dirty N/A
Downtown Honda, Spokane, WA 01/14/08 Honda Good Normal Clean N/A
Ramey Ford, Johnson, TN 01/21/08 Ford Good Normal Dirty N/A
Santa Monica Auto Group, Santa Monica, CA 01/31/08 Chevy Good Normal Clean N/A
Mercedes of Encino, Encino, CA 02/05/08 Mercedes Bad Failure De-lamination N/A
Blake Chevy, Homestead, FL 02/14/08 Chevy Good Normal Clean N/A
Land Rover of Portland, Portland, OR 02/14/08 Land Rover Good Normal Dirty N/A
Vann York Pontiac GMC Buick, High Point, NC 02/18/08 GMC Good Normal Clean N/A
Alexander Family Dealerships, Bloomsburg, PA 02/19/08 Chevy Good Normal Clean N/A
Jim Jard Chevy, Rosenburg, TX 02/28/08 Chevy Good Normal Clean N/A
Banks Chevy, Concord, NH 03/12/08 Chevy Good Normal Dirty N/A
Lexus of Water Town, Water Town, MA 03/14/08 Lexus Bad Out of Range Dirty N/A
Kent Chevy, Mountain Home, AR 03/14/08 Chevy Good Normal Clean N/A
FlowCadillac, Winston-Salem, NC 03/19/08 Cadillac Bad Out of Range Dirty Silicone
Advantage Porsche, Houston, TX 03/19/08 Porsche Bad Failure Dirty Silicone
Parks Chevy, Huntersville, NC 03/25/08 Pontiac Good Normal Dirty N/A
Stevens Creek BMW, Santa Clara, CA 03/31/08 BMW Bad Out of Range Clean N/A
Bleecker Chev/Pontiac/Buick, Dunn, NC 04/11/08 GMC Bad Out of Range Clean N/A
Alaska Sales and Service, Anchorage, AK 04/11/08 Chevy Good Normal Dirty N/A
Midway GMC, Phoenix, AZ 04/11/08 GMC Good Normal Clean N/A
Walter's Mercedes Benz, Riverside, CA 04/14/08 Mercedes Bad Failure De-lamination N/A
Lexus of San Antonio, San Antonio, TX 04/22/08 Lexus Bad Out of Range Dirty Silicone
Crest Chevy, Jacksonville, FL 04/30/08 Chevy Good Normal Dirty Silicone
Volkswagen of Ft. Meyers, Ft. Meyers, FL 05/05/08 Volkswagon Good Normal Clean N/A
Carmax, Indianapolis, IN 05/09/08 Oldsmobile Good Normal Dirty Silicone
Paul Moak, Jackson, MS 05/15/08 Volvo Bad Failure De-lamination N/A
Costal Mitsubishi, Melbourne, FL 05/20/08 Mitsubishi Bad Failure Clean N/A
Earn Hurt Ford, Chandler, AZ 05/22/08 Ford Good Normal Dirty N/A
Vara Chevy, San Antonio, TX 06/23/08 Land Rover Good Normal Clean N/A
Hatfield Buick and GMC, Redlands, CA 07/11/08 GMC Good Normal Clean N/A
Sandy Sansig Chevy, Pensacola, FL 07/16/08 Chevy Good Normal Dirty N/A
Royal Audi Motors, San Francisco, CA 07/21/08 Audi Good Normal Dirty N/A
Morehart Chevy, Durango, CO 07/24/08 Chevy Good Normal Clean N/A
BMW Cleveland, Solon, OH 07/28/08 BMW Good Normal Clean N/A
Suss GMC Pontiac Buick, Aurora, CO 07/29/08 GMC Good Normal Dirty N/A
Morrison Porsche, Anchorage, AK 08/01/08 Porsche Bad Failure De-lamination N/A
Hudiberg Chevy, Midwest City, OK 08/05/08 Chevy Good Normal Clean N/A
Galpin Ford, North Hills, CA 08/11/08 Ford Good Normal Clean N/A
BMW of Towson, Towson, MD 08/14/08 BMW Bad Failure De-lamination N/A
Foothill Ranch Chevy, Foothill Ranch, CA 08/25/08 Chevy Good Normal Dirty Silicone
Mooreheart Chevy, Durango, CO 09/11/08 Chevy Bad Out of Range Clean N/A
McCaddon, Boulder, CO 09/16/08 GMC Good Normal Dirty Trace Oil
Pike Wheaton Chevy, Red Deer, AB 09/26/08 Chevy Good Normal Dirty Silicone
Bob Moore Ford, Oklahoma City, OK 09/30/08 Ford Good Normal Dirty N/A
City Garage, Ft. Worth, TX 10/03/08 Ford Good Normal Dirty Silicone
O'Riley Chevy, Tuscon, AZ 10/28/08 Chevy Good Normal Clean N/A
New Carlisle Ford, New Carlisle, OH 10/28/08 Ford Good Normal Clean N/A
North Bakersfield Toyota, Bakersfield, CA 11/04/08 Toyota Bad Out of Range Dirty Silicone
Cypress Coast Ford Lincoln, Seaside, CA 11/21/08 Ford Good Normal Dirty Corrosion
Caper Auto Center, Moringo, IA 12/02/08 Chevy Good Normal Clean N/A
Concourse Automotive, Murray, UT 12/04/08 Audi Bad Out of Range Dirty N/A
Gustman Chevrolet, Kaukauna, WI 12/31/08 Chevy Good Normal Clean N/A
Ken Garff Ford, American Fork, UT1/5/2009FordBadOut of rangeDirtyN/A
Porsche of Fairfield, Fairfield, CT1/6/2009PorscheGood NormalDirtyN/A
Newburg Nissan, Newburg, NY1/7/2009NissanGoodNormalDirtyN/A
Ottowa Ford, Ottowa, KS1/30/2009FordBadOut of rangeDirtyN/A
Mid City Auto, Lake Charles, LA2/2013/2009FordGoodNormalCleanN/A
Toyota of Glendora, Glendora, CA2/19/2009ToyotaGoodNormalCleanN/A
Infinity of Melburn, Melburn, FL2/19/2009InfinityGoodNormalCleanN/A
Millenium, Dallas, TX3/2013/2009JaguarGoodNormalDirtySilicone
Toronto Downtown Porsche, Canada3/23/2009PorscheBadFailureDe-laminationN/A
Dick Norris Auto, Palm Harbor, FL 3/26/2009 GMC Good Normal Clean N/A
Merc.Benz of Alexandria, Alexandria, VA4/8/2009MercedesBadOut of rangeDirtySilicone
Aarow Transmission, Reno, NV4/9/2009ChevyGoodNormalCleanN/A
LandRover New Port Beach, CA4/2013/2009LandRoverGood NormalDirtyN/A
Teton Motors, Jackson, WY4/23/2009ChevyBadOut of rangeDirtyN/A
Bale Chevrolet, Little Rock, AR4/30/2009ChevyGoodNormalCleanN/A
Marvin K. Brown Auto Center, San Diego, CA4/30/2009CadillacGoodNormalCleanN/A
Merc.Benz, Long Beach, CA5/11/2009MercedesGoodNormalDirtySilicone
Thelan VW, Bay City, MI5/15/2009VWGoodNormalCleanN/A
Scoggin Dickey, Lubbock, TX6/10/2009ChevyGoodNormalCleanN/A
Revtech Auto Center, Cambridge, ON, Canada 6/23/2009 Lexus Good Normal Dirty N/A
Ed Bozrts Chev., Grand Junction, CO 6/25/2009 Chevrolet Good Normal Dirty N/A
Vern Eide Motor Cars, Inc., Sioux Falls, SD 7/2/2009 Honda Bad Failure Dirty N/A
Dellenbach Motors, Ft. Collins, CO 7/8/2009 Chevrolet Bad Out-of-Range Dirty Silicone
Crest Chev., San Bernardino, CA 7/10/2009 Chevrolet Good Normal Dirty N/A
Singh Chev., Riverside, CA 7/20/2009 Chevrolet Good Normal Clean N/A
Tonkin Mazda, Portland, OR 7/24/2009 Mazda Good Normal Clean N/A
Stones River Motors, Murfreesboro, TN 7/28/2009 Nissan Good Normal Clean N/A
Turpin Autos Limited, ON, Canada 8/5/2009 GMC Bad Out-of-Range Dirty Silicone
Whitaker GMC, Forest Lake, MN 8/12/2009 GMC Good Normal Clean N/A
Greenville GMC, Greenville, TX 8/19/2009 GMC Good Normal Clean N/A
Montgomeryville Nissian, Montgomeryville, PA 8/31/2009 Nissan Bad Out-of-Range Dirty Silicone
Don Davis Ford, Arlington, TX 9/1/2009 Ford Bad Failure Clean N/A
Bachman Auto Group, Louisville, KY 9/29/2009 Hummer Bad Out-of-Range Dirty N/A
Ultimate Pontiac GMC, Fredericksburg, VA 9/30/2009 GMC Good Normal Clean N/A
Lithia Chev., Redding, CA 10/1/2009 Chevrolet Good Normal Clean N/A
Reliable Chev., Springfield, MO 10/5/2009 Chevrolet Bad Failure Clean N/A
Romans Motor Co., Independence, KS 10/7/2009 Chevrolet Good Normal Dirty N/A
Gallagher GMC, New Britain, CT 10/20/2009 Chevrolet Good Normal Clean N/A
Brandon Hyundai, Tampa FL 10/21/2009 Hyundai Good Normal Clean N/A
Blue Ridge Motors, Kingsport, TN 10/29/2009 BMW Good Normal Clean N/A
Metro Toyota, Clevland, OH 11/23/2009 Toyota Bad Failure Dirty Silicone
Brent Brown Ford, Provo, UT 12/9/2009 Ford Good Normal Clean N/A
Fisher Chevrolet Honda, Boulder, CO01/04/10ChevroletBadOut-of-RangeCleanN/A
Borgan Ford Mazda, Grandville, MI01/11/10FordBadOut-of-RangeDirtyN/A
Bill Crispin Chevrolet, Saline, MI01/14/10ChevroletGoodNormalCleanN/A
Pat McGrath Cheyland, Cedar Rapids, IA01/15/10ChevroletGoodNormalCleanN/A
Patriot Chev. Buick GMC, Hopkinsville, KY01/27/10ChevroletGoodNormalDirtyN/A
McGavock Nissan, Lubbock, TX02/17/10NissanBadOut-of-RangeDirtyN/A
Nix Chevrolet, McAlester, OK03/02/10ChevroletGoodNormalCleanN/A
Sewell Cadillac, Dallas, TX03/08/10CadillacBadFailureCleanN/A
Bob Baker Toyota, San Diego, CA03/11/10ToyotaBadOut-of-RangeDirtyN/A
Ramey Chevrolet Cadillac, Sherman, TX03/15/10ChevroletGoodNormalCleanN/A
Toyota of Escondido, Escondido, CA03/26/10ToyotaGoodNormalCleanN/A
Pete Moore Automotive, Pensacola, FL03/29/10ChevroletGoodNormalCleanN/A
Val Mark Chevrolet, New Braunfels, TX04/07/10ChevroletGoodNormalCleanN/A
O'Rielly Chevrolet, Tucson, AZ05/07/10ChevroletGoodNormalCleanN/A
Valmark Chevrolet, New Braunfels, TX06/23/10ChevroletGoodNormalCleanN/A
True North Chevrolet, North Bay, ON, Canada06/24/10ChevroletGoodNormalCleanN/A
Infiniti of Tampa, Tampa, FL06/25/10InfinitiGoodNormalCleanN/A
Paradise Chevrolet, Temecula, CA06/29/10ChevroletBadOut-of-RangeCleanN/A
Green Buick GMC, Davenport, IA7/2/2010GMCGoodNormalCleanN/A
Redline Automotive LTD., Richmond, BC7/8/2010JaguarBadout-of-rangeCleanN/A
Doan Chevrolet, Spencerport, NY7/8/2010ChevroletGoodNormalCleanN/A
Folsom Chevrolet, Folsom, CA7/2013/2010ChevroletGoodNormalCleanN/A
Art Moehn Chevrolet, Jackson, MI8/9/2010ChevroletGoodNormalDirtyN/A
Land Rover Solon, Solon, OH8/2013/2010Land RoverBadout-of-rangeCleanN/A
Rydell Chevrolet, Waterloo, IA8/31/2010ChevroletGoodNormalCleanN/A
Doan Chevrolet, Spencerport, NY8/31/2010ChevroletGoodNormalDirtyN/A
Reedman Toll Auto world, Langhorne, PA 9/6/2010GMCGoodNormalDirtyN/A
Dick Edwards Ford, Manhattan, KS9/7/2010FordGoodNormalDirtyN/A
Millbury Ford/Mercury, Charlton, MA9/8/2010FordGoodNormalCleanN/A
Spirit Toyota, St. Louis, MO9/28/2010ToyotaGoodNormalDirtyTrace oil/Silicone
Toyota-Scion of Stafford, Stafford, VA10/12/2010ToyotaGoodNormalCleanN/A
Bankston Chevrolet, Fort Worth, TX10/14/2010ChevroletGoodNormalCleanN/A
Global Imports BMW, Atlanta, GA10/26/2010BMWGoodNormalCleanN/A
James Corlew Chevrolet, Clarksville, TN11/12/2010ChevroletGoodNormalCleanN/A
Wappinger Falls Toyota, Wappinger Falls, NY11/24/2010ToyotaBadout-of-rangeDirtySilicone
Lithia Auto Stores Chevrolet, Redding, CA11/24/2010ChevroletGoodNormalCleanN/A
Shearer Chevrolet, Burlington, VT12/6/2010ChevroletGoodNormalCleanN/A
Bryan Chevrolet, Metairie, LA2/28/2011ChevroletGoodNormalCleanN/A
BMW of Bayside, Great Neck, NY3/1/2011BMWBadFailureCleanN/A
Sweeney Chevrolet, Youngstown, OH3/9/2011ChevroletGoodNormalCleanN/A
Parks Chevrolet, Huntersville, NC4/11/2011ChevroletGoodNormalCleanN/A
Driver's Auto Repair, Conroe, TX5/3/2011VolkswagonGoodNormalCleanN/A
Tomball Ford, Tomball, TX5/6/2011FordGoodNormalCleanN/A
Ray Smith Chevrolet, Camden, TN6/16/2011ChevroletGoodNormalCleanN/A
Metro Honda, Jersey City, NJ 7/2013/2011 Honda Good Normal Dirty Trace oil
Roger Chevrolet, Woodhaven, MI 7/20/2011 Chevrolet Good Normal Clean N/A
Darby Buick/GMC, Venice, FL 7/20/2011 GMC Good Normal Clean N/A
Fairfax Chevrolet, Fairfax, VA 7/22/2011 Chevrolet Bad Out of range Clean N/A
Val Mark Chevrolet, New Braunfels, TX 7/27/2011 Chevrolet Good Normal Clean N/A
Tumwater Automotive Group, Tumwater, WA 7/29/2011 Chevrolet Good Normal Clean N/A
Spradley Barr Ford, Ft. Collins, CO 8/3/2011 Ford Bad Out of range Dirty N/A
Jaguar/Land Rover of Baton Rouge, LA 8/4/2011 Land Rover Good Normal Dirty N/A
Vestal Buick/GMC, Kernersville, NC 8/8/2011 Chevrolet Good Normal Clean N/A
Suburban Volvo, Troy, MI 8/12/2011 Volvo Good Normal Clean N/A
Eurotech Autowerks, Virginia Beach, VA 8/17/2011 Volvo Good Normal Clean N/A
Ocello's Automotive Center, Tamarac, FL 8/18/2011 Mercedes Bad failure clean N/A
J.C. Billion GMC, Bozeman, MT 8/24/2011 Chevrolet Good Normal Clean N/A
Champman Bell Road Imports, Phoenix, AZ 8/26/2011 Hyundai Good Normal Clean N/A
Alaska GM Sales&Service, Anchorage, AK 9/9/2011 Chevrolet Bad Out of range Dirty N/A
Midas Auto, St. Cloud, MN 9/12/2011 Audi Bad Failure Clean N/A
Metropolitan Ford, Eden Prairie, MN 9/12/2011 Ford Good Normal Clean N/A
Murray Chevrolet, Merritt, BC, Canada 9/16/2011 Chevrolet Bad Out of range Dirty N/A
Bristol Toyota Scion, Bristol, Rhode Island 9/21/2011 Toyota Bad Out of range Dirty N/A
Lebanon Ford, Lebanon, OH 9/22/2011 Ford Good Normal Clean N/A
Mike Savoie Chevrolet, Troy, MI 9/26/2011 GMC Bad Out of range Dirty Silicone&trace oil
Reno Vulcanizing Works, Sparks, NV 9/26/2011 VW Bad Failure Dirty Silicone
Blade Chevrolet, Mount Vernon, WA 10/7/2011 GMC Good Normal Clean N/A
Ed Koehn Chevrolet, Rockford, MI 10/10/2011 Chevrolet Good Normal Clean N/A
Singh Chevrolet, Riverside, CA 11/15/2011 Chevrolet Good Normal Dirty N/A
Medford Ford, Marlton, NJ 12/20/2011 Mercury Good Normal Clean N/A
James Wood GMC, Denton, TX 1/18/2012 GMC Good Normal Clean N/A
Botnick Chevrolet, Binghamton, NY 4/11/2012 Chevrolet Good Normal Dirty N/A
Modern Nissan, Winston-Salem, NC 4/16/2012 Nissan Good Normal Clean N/A
Champion Chevrolet, Reno, NV 4/26/2012 Chevrolet Good Normal Dirty N/A
Garrett Motors Chevrolet, Coolidge, AZ 4/26/2012 Chevrolet Bad Failure Dirty Silicone&trace oil
Gusweiler GM Center, Washington, OH 5/15/2012 Chevrolet Good Normal Clean N/A
Gillman Honda, Houston, TX 5/22/2012 Honda Bad Failure Dirty N/A
Lake Chevrolet, Lake Elsinore, CA 5/31/2012 Chevrolet Good Normal Clean N/A
Automotive Service Center, Lompoc, CA 6/20/2012 Ford Good Normal Dirty N/A
Southern Chevrolet, Foley, AL 8/3/2012 Chevrolet Bad Out of Range Clean N/A
Sun Chevrolet, Chittonango, NY 8/23/2012 GMC Good Normal Dirty N/A
Straub Nissan, Wheeling, WV 8/30/2012 Nissan Good Normal Clean N/A
Marysville Ford, Marysville, WA 9/7/2012 Ford Good Normal Clean N/A
Karl Klement Ford, Decatur, TX 9/10/2012 Ford Good Normal Clean NA
Bobby's Pit Stop, Santa Cruz, CA 9/14/2012 Toyota Bad Failure Dirty N/A
Barrier, LLc Honda, Bellevue, WA 9/24/2012 Audi Good Normal Clean N/A
Far North Rover LLC, Anchorage, AK 10/4/2012 Land Rover Good Normal Clean N/A
Silver Star World Wide Auto, Ormond Beach, FL 10/17/2012 Mercedes Bad Out of Range Dirty N/A
Peoria Ford, Peoria, AZ 10/23/2012 Ford Good Normal Dirty Silicone
Raisor Ford, LaFayette, IN 10/29/2012 Ford Good Normal Dirty N/A
Rob's Automotive Inc, Dallas, OR 10/30/2012 Ford Good Normal Clean N/A
Marchant Chevrolet, Ravenel, SC 1/10/2013 Chevrolet Good Normal Clean N/A
Leigh Automotive, Tuscaloosa, AL 1/14/2013 Mercedes Bad Out-of-range Dirty N/A
Woodbidge GMC, Woodbridge, VA 1/30/2013 GMC Good Normal Clean N/A
Future Ford, Roseville, CA 2/14/2013 Ford Good Normal Dirty N/A
Grand Ledge Ford Lincoln, Grand Ledge, MI 2/19/2013 Ford Good Normal Clean N/A
Mac Daddy Motor Worx, Grand Junction, CO 81501 2/25/2013 BMW Good Normal Clean N/A
Riverton Hyundai, Sandy UT 3/8/2013 Hyundai Good Normal Clean N/A
Elk Grove Ford, Elk Grove, CA 3/2013/2013 Ford Good Normal Clean N/A
World Toyota, Atlanta, GA 3/30/2013 Toyota Good Normal Clean N/A
Mercedes Benz of Chandler, Chandler, AZ 5/6/2013 Mercedes Bad Out-of-range Dirty N/A
Secor's Automotive, San Diego, CA 5/8/2013 Toyota Good Normal Dirty N/A
Greg's Japanese Auto, Puyallup, WA 5/8/2013 Toyota Good Normal Dirty N/A
Motor City Buick/GMC, Bakersfield, CA 93384 5/17/2013 Buick Good Normal Clean N/A
Wesley Chapel Hyundai, Wesley Chapel, FL 6/26/2013 Hyundai Good Normal Clean N/A
L&M Motors, Inc., Athens, TN 1/24/2014 GMC Good Normal Clean N/A
Summit Ford, Silverthorne, CO 1/27/2014 Ford Good Normal Clean N/A
Johnson Nissan, Pittsfield, MA 2/3/2014 Nissan Good Normal Dirty N/A
Camelback Subaru, Phoenix, AZ 2/7/2014 Subaru Bad Out of range Dirty Silicone
North County Hyundai, Carlsbad, CA 2/14/2014 Hyundai Bad Out of range Clean N/A
Cardinal Auto Group, Seaside, CA 2/21/2014 GMC Good Normal Dirty N/A
Mossy Volkswagen, El Cajon, CA 2/25/2014 Volkswagen Good Normal Clean N/A
Jim Butler Chevrolet, Fenton, OH 2/26/2014 Chevrolet Good Normal Dirty N/A
Dutton Cadillac/GMC, Riverside, CA 4/10/2014 Cadillac Good Normal Clean N/A
Keyes Chevrolet, Van Nuys, CA 5/30/2014 Chevrolet Good Normal Clean N/A
Lake Chevrolet, Lake Elsinore, CA 6/26/2014 Chevrolet Good Normal Clean N/A
 

K&N FILTER OIL HAS NEVER BEEN CONFIRMED AS A SOURCE OF CONTAMINATION ON A MAF SENSOR!