Quote:
Originally Posted by OwlDance
You need a tune. Aftermarket headers almost all but require one, whether or not they're catted. That'll be the reason why you get an AFR imbalance and code since it deals directly with exhaust flow.
CAIntakes will also alter your AFR though sometimes not to the point of generating engine codes by themselves. Hit and miss at generating codes, but also questionable (if any) gains too.
The two combined is almost certainly what's causing the AFR imbalance, sort of surprised the dealer didn't note them at all..
OFT or Ecutek will get you sorted out.
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Thanks for the reply and insight.
As for the CAI, I have done quite a few extensive test drives with nothing but the CAI installed. No CEL. That is why I am pinpointing the culprit of the AFR codes is the header.
To my knowledge, I am supposed to only get a P0420 code for not having a cat in the header and
not these AFR codes. But your explanation does make sense. So you're saying that an adjustment in the AFR from a tune can solve this AFR issue?