Thanks^^ I already have been carrying the DMM around in the glovebox with me! LOL I'll be keeping an eye on it...

The CEL hasn't come back on, either...and it is idling and starting better than it has in a long while...really confusing.

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