Quote:
Originally Posted by Johnny Danger
Take the old one out, and put the new one in . The DME will be unaltered by this .
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Actually, that is not correct. The DME will lose all active and pending codes, as well as its adaptive settings. The car may run a bit rough until it "relearns the " these settings. This is why a lot of shops put the car on a system retains power while the battery is out, so nothing is lost. On some 911 variants, the car can actually lose the calibration settings for the fuel level when changing the battery, requiring the system be re calibrated, which is a major pain in the butt...........