Today I got a check engine light on my '04 A6 2.7T (It has >74K miles on the road). I stopped by Advance Auto to have them check the check the codes and I got the following print out

P0175
System Too Rich
(Bank 2)

P0172
System too Rich
(Bank 1)


Could this be the O2 sensors? Could all O2's go at the same time?

Alittle more history - Iput in a new K&N filter in the factory air intake a couple of days ago. Could this a a reason for the error codes?

 

I did a search on my codes and found this https://www.audiforums.com/m_416202/tm.htm. Does anyone know where the EVAP Canister purge valve is? I also would like to know where the suction jet pump is. Any help would greatly be appreciated.

 

If you do a search in this Forum, you'll see some threads about K&N air filters. In a couple of them they warn that excess oil from the K&N could mess up the MAF (mass air flow?) sensor. Something else to consider.

I've run one for 30k+ without problems, but you need to be sure to let excess oil drain (after cleaning and before re-installing).

 

Would a dirty MAF cause the car to run rich?

 

FYI, I bought some STP intake/throttle cleaner. Took out the MAF and sprayed the heck out of the sensor. The light stayed on for about a day (by this I mean a 30mi trip to work and 25 mi back. I take my son to school in the morning and my wife picks him up). This morningI noticedthat the light is out.

 

if it comes on again look for leaks in the vacuum and exhaust