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Water is coming in around the trunk seal and tail light seals. ...
That black cap were the cable goes through the floor, has a 13mm nut on it, and is very prone to corroding. Remove the cable and clean the terminal, and post. Replace if necessary.
Then clear all codes and see what comes back. You'd be surprised what a little corrosion will cause on these cars.
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2014 M5 6MT  |