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I'll fill out one of those templates after work for my N51 but wanted to share some of my "progress" and research.
While I am not well versed on the functionality, a few others have mentioned that msv80.1 (what our N51 128s are running) is diff from msv80 to satisfy SULEV emissions reqs. The biggest diff in additional equipment is the secondary air pump. I have removed mine, a relay, put a block off in place, and had BPC code out the error. My idle issue still persists.
After some more research on MSV80.1 specifically I saw a thread where someone (I think hass?) was of the opinion running a N52 MSV80 coded to work with the N51 engine would be the only way to truly eliminate the emissions systems functions from 80.1. Do I know this is the root cause of my idle issue? No, but like many others I've changed out parts and sensors that could be the culprit, relearned end stops for vanos, and reset adaptations numerous times.
Cheers and thanks for your effort!
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