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      02-05-2018, 02:32 PM   #5
Jeff@TopGearSolutions
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Drives: C6 Z06, 09 335i, 10 335xi
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Quote:
Originally Posted by langsbr View Post
You should reconsider not installing the rear o2s, or at least one at a minimum. Even though you may have the code disabled, it only disables you seeing the error code, but the DME still uses the secondary O2s for adjusting trims. I didn't believe it at first, as they are supposed to be only for catalyst efficiency, but multiple developers for the DME XDFs have confirmed they are needed.
Yep, OP should definitely run Rear o2 sensors for air fuel trims.
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