Quote:
Originally Posted by ferocity02
Is there any proof that leaving a DP fix in will affect fuel trims over time? I hear this a lot, but have never seen proof.
Is it different for N54 vs. N55?
It is my understanding that the pre-cat O2/lambda sensors should be the only ones that have the ability to affect fuel trims (and AFR). The purpose of the cat is to process and "clean" the exhaust, so the post-cat O2 sensor isn't really seeing the true AFR, or is seeing a processed version of it, and thus should not have any say in the fuel trims. The
Please correct me if I'm taking out of my ass.
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I have heard that someone I know well has had their Standalone DP Fix on at 5 OClock from 45k miles on the clock to about 186k miles and counting. Still has the original O2's and car still runs. So I'm still waiting on proof for needing to remove the stand alone DP Fix
Would resetting adapts count as resetting the Long term fuel trims? I think this might have been done a couple times during service visits over the lifetime.