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Bad coolant temp sender or bad ECU? S80 2001

Didn't know about the CEM, thanks, but all I've found about the DIM is for a bad one messing up the dash displays. Haven't seen anything about a bad DIM creating engine starting/running problems. Do you have info that the DIM can get in the way of info to the other components and so create issues like mine?

btw, it turns out I have the brake controller part# which Midwest ABS says almost never fails (thanks for that link!). So I'm going to put that back in and assume that the theory that this was the original root of my issues is bogus even though the original message was about STC.






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