Hello everyone. I'm throwing some codes and was hoping you guys could help me out. I have a 2002 s4 with APR Bi-Pipe, Hyperboost Diverter Valves, AWE s-flo intake, APR chip, custom 3" cat back and a level 10 transmission. I'm throwing the codes listed below. I know that it could be a dirty MAF or an O2 sensor etc. My question is with the codes I have listed does it narrow down my problem? Any information would be great. Thanks!

P0172 Rich bank 1
P0175 Rich bank 2
P0171 lean bank 1
P0174 lean bank 2

Thanks a lot!

 

Does nobody know or am I to assume that these codes together do not narrow down my problem.

 

Have you done anything to the downpipes? or is it just the regular exhaust? If I was to have to guess now I would lean more towards the o2's but the maf is also a high probability, so clean that cause its easy to do and getback with the dp's..

 

over fuling I guess and could be the fuel pressure regulator depending on mods

 

Well I have all the mods listed above none of which are the downpipes. I'll clean the maf and see what happens. Thanks guys.

 

I was only leaning towards that in hope of an easy fix for you.

 

Check for vacuum leaks.