i just replaced my oem exhaust with a turbo back system and now my cel is on saying my cat efficiency is too low. what is this about? would getting it tuned fix this? if not could i clean my o2 sensors for a fix?
If you did a cat-less downpipe thats why your check engine light came on, and some of the "high performance" cat's do not perform like OEM and are usually slightly out of spec for the OEM computer. Quick and easiest way would be a O2 spacer for the downstream O2
98 Jetta VRT http://www.youtube.com/watch?v=glYL6Qn8mVo http://www.youtube.com/watch?v=bGI5kkCXBlA sold 07 Audi A4 Sline H&R coilovers
07 Jetta Fahrenheit GLi apr stage 2, Apr DP,Spec Stage3 w/Alum flywheel, torque solutions mounts,Forge DV,42 draft stealth catch can, Koni coils,19x8.5 VMR 710s,CTS turbo intake