Symptoms of a Bad or Failing EVP Position Sensor

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The EVP sensor is an emission system component found on certain vehicles. It is a part of the EGR system, the emissions system that recirculates exhaust gases back into the engine to reduce cylinder temperature and NOx emissions. The EVP sensor monitors the position of the EGR valve so that the computer can adjust it according to operating conditions. [When the sensor fails] it can cause problems with the functionality of the EGR system, which can result in increased emissions. Usually a bad or failing EVP position sensor will produce a few symptoms that can alert the driver of a potential problem that should be serviced.

1. Poor cold start performance

One of the first symptoms of a potential problem with the EVP sensor is poor cold start performance. If the EVP sensor fails it can send an incorrect signal to the computer, which will affect the flow of the EGR system. Improper EGR flow may cause engine performance issues, such as difficulty starting, rough idle, and even misfires, which may be most prominent at cold starts.

2. Check Engine Light comes on

Another symptom of a potential problem with the EVP position sensor is a Check Engine Light. If the computer detects an issue with the EVP position sensor or circuit it will set off the Check Engine Light to alert the driver of a potential issue. The Check Engine Light can also be set off by a wide variety of other problems, so having the vehicle scanned for trouble codes is highly recommended.

2. Failed emissions test

A bad or failing EVP sensor can also result in a [failed emissions test]. If the EVP positions sensor malfunctions and affects the functionality of the EGR system this may result in an increase of NOx emissions. For states with strict emissions requirements, the vehicle may not be able to be registered until the issue is fixed.

The EVP position sensor is an emissions component, and any problems with it can result in the vehicle failing an emissions test. For this reason, if you suspect that your EVP sensor may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the issue should be replaced.


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Rigoberto

9 years of experience
706 reviews
Rigoberto
9 years of experience
Chevrolet Equinox - Brake Pads Replacement (Rear) - Niles, Illinois
Rigo was great! He got there early, finished the job early, left everything clean. He changed my rear pads and rotors. The original quoted time was 90 minutes, he was done in about 60. He knows what he is doing and I am recommending him to all my friends and coworkers.
Mercedes-Benz C250 - Brake Pads Replacement (Front, Rear) - Chicago, Illinois
Rigo is a maverick hands down. Don’t take your car for work elsewhere. Especially great at Mercedes—this guy knows his profession! I will be using him for everything related to my car going forward.

Arturo

25 years of experience
35 reviews
Arturo
25 years of experience
Kia Forte - Brake Pads Replacement (Front) - San Diego, California
ARTURO is great! very professional , fast, replaced my front brake pads and oil an filter change. everything now works and works well. Brakes have much improved stopping power and engine is smooth and quiet.Arturo is also kind and thoughtful. "Your mechanic" is very fortunate to have Arturo Lopez represent your company. I enthusiastically recommend him and "Your mechanic> as a fine operation Best regards to the Team Peter Marto
Nissan Maxima - Brake Pads Replacement (Front, Rear) - San Diego, California
Arturo was prompt and completed my brake repair, including new rotors in a very efficient manner. I am very pleased with the quality of the work and the parts and will definitely look to have him service our other car in the near future.

Scott

32 years of experience
345 reviews
Scott
32 years of experience
Lexus IS250 - Brake Pads Replacement (Rear) - Denver, Colorado
Always on time, speedy, professional, and pleasant to interact with. The work is always consistent and we'll done. I can't reccomend Scott highly enough!

Michael

10 years of experience
15 reviews
Michael
10 years of experience
Nissan Sentra - Brake Pads Replacement (Front) - Conyers, Georgia
He was promptly on time and got the job done efficiently in a timely manner. I really appreciate the rapid respone on getting the job done! I would most definitely use this service again.

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