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reset check engine light, see what codes comes back if they come back- could be old phantom codes from previous errors not properly reset.
Pop the hood while you hit the washers- you'll see it spitting bad under the hood passenger side if the lines are broken.
As long as the car isn't pieced together from two M5's I'd check the brake light switch. Can fail....I wouldn't be scared of it, really.
Look up i910 scanner- I LOVE MINE. Reads all BMW codes- these cars are so sophisticated it will tell you if your AUX fan is going it- it did on mine, and it was correct.
rjp
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