Quote:
Originally Posted by langsbr
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.
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Yep, OP should definitely run Rear o2 sensors for air fuel trims.