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      08-20-2021, 03:26 PM   #9
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Drives: Bmw 335i
Join Date: Aug 2021
Location: NYC

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Originally Posted by whyzee125 View Post
I think the front o2ís report fuel ratios and the rears report cat efficiency and calibrate the front o2ís. If your rears are truly disabled, they shouldnít be. Stage 2 and up tunes should keep your light off but all they do is prevent the readiness from setting. Itís likely o2 related or possibly injector related. I would find a new shop that can smoke test your whole intake system and check for leaks. This shouldnít be tune related but try switching back to stock tune.

I would go to another shop if I can find a better one this one I go to is upon one of the best in NY and NJ so itís even that much concerning after smoke tests and many diagnoses they still have trouble themselves, go back to stock tune with no DP fix?
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