ok...so this code keeps popping up... can anyone tell me why its going off and what i can do to fix it....i bought the car with aftermarket exhaust but it just started going off 9 months after buy the car... its annoying and i want it fixed!!!! any help will be greatly appreciated

bump

 

P0172 Fuel Trim System Rich -PCM

https://www.cobaltss.net/forums/showthread.php?t=3480

hope that helps

 

well that told me what is was....but now how do i fix it???? i feel like it is just a o2 sensor buti dont qwant to spend the $120 if its not it

 

P0172 means car thinks its running too rich. It may actually be or it may not.

If it is, you need to check for restricted air filter, or air intake, stuck on EVAP purge valve, leaking fuel injectors, failed fuel pressure regulator.

If its not (just thinks it is) you could have a bad O2 sensor, damaged wiring, a faulty PCM.

 

P0172 means car thinks its running too rich. It may actually be or it may not.

If it is, you need to check for restricted air filter, or air intake, stuck on EVAP purge valve, leaking fuel injectors, failed fuel pressure regulator.

If its not (just thinks it is) you could have a bad O2 sensor, damaged wiring, a faulty PCM.

 

ok maven.... what would be the quickest way to check all of that (minus the air intake cuz i can figure that out....=))