My gas cap was over lubricated it seems. It was getting loose from vibration. Twice threw "very small leak" and once "large leak". I noticed the cap was not very tight after the first small leak error and was not turned on at all with the large leak. Upon further testing and diagnoses I discovered that it took almost no effort to twist off the cap.

Looked at the o ring and it was very well greased. I removed o-ring and flipped as well as wiped the grease down to just a film.

After that process it was 5x more difficult to twist off the cap (still not hard by any means) and no faults since and passed emissions.


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)