Hey trueog, take ozzy's advice and change the OVP. I'm amazed that none of the MB "experts" you've taken it to couldn't figure it out!!! Yeah, it can make the CEL come on. It can cause the ABS light to come on. It can cause the engine to stall. It can cause the crank/no-start condition too. It can also kill the battery and ruin expensive control modules (HFM-SFI, ABS). Just replace it and you'll be done pushing the car all over the place!!!