I was pretty sure the C1142 code wouldn't limp the car, but since it was basically the only code I was able to decipher, that maybe it was worth asking.

You are absolutely right that it could be the scanner. I'm taking it to a friend tomorrow who has MB SDS and will update.

Thank you SO much TimFreeh, for giving this issue your attention and a second set of eyes.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles