Happy to report that I tracked down the errant bolt in my car and it was already as tight as I could get it. It’s a 13mm bolt if anyone else needs to find the right spanner. Checked the battery connectors too and got another quarter turn in both.

Javier - I’m hoping you’re going to find all my potential problems for me! I already checked my mudguard bolts (they were the right way round), and followed your lead on the s&s air filter cover.

Last edited by JohnMat; 09/06/20 04:05 AM. Reason: Typo
2020 M3W