I don’t drive my wife’s X6 often but have also been dealing with mis-fire symptoms. I say symptoms because I don’t get a notification and the independent service company, I use doesn’t get any codes. I’ve had all the coils and spark plugs replaced and that didn’t correct the problem. My service guy suggested I take it to a dealer and get the software updated to the most current. The dealer talked my wife, who dropped the car off, into a full diagnosis against my directions. They did finally update the software. I also have MPPK.
The dealer claimed there was a misfire code on cylinder 1 and after swapping spark plugs between 1 and 2, the mis-fire code moved to cylinder 2. They said they wouldn’t troubleshoot any further unless replacing all the brand new Bosch spark plugs with BMW OEM at an un-godly price. I declined and took it back to my BMW service guy to replace at no charge. He had been a top service tech at this same dealer before starting his own company. First, he didn’t pull any codes. Second, he swapped out both cylinder 1 and 2 sparkplugs and both he replaced looked fine.
None of this solved the problem. It still feels like it miss-fires occasionally, usually when going up hills. He thought it might be a fuel injector issue and gave me some Liquid Moly DIJection to add with the next gas fill-up. It may have helped a little, hard to be sure, but the problem still exists. I’ll try adding DIJection again after a few more fill-ups.
Any suggestions on how to resolve this? Thanks
@faboR6
https://f15.bimmerpost.com/forums/sh....php?t=1688446
@schung
https://f15.bimmerpost.com/forums/sh...light=injector