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[Eric S.]

Car: 1999 540/6 Sport

I'm getting a SES light, but after reset it doesn't appear on the first drive; after driving 15 to 20 minutes and stopping, the SES light appears on the way home from such a trip. Twice in a row this has happened and twice I've checked the code with my handy dandy Peake Research R5/FCX-II, and both times I am getting the following codes:
1A - "Mixture Control, off idle, cyl #1-4"
1B - "Mixture Control, off idle, cyl #5-8"
- no other codes.

I get no noticable symptoms that anything is wrong, no stalling, nothing.

So what do you guys think this issue is? I am thinking it's something serving the entire engine since it's hitting both cylinder banks, or else I'd be thinking O2 sensor(s). Does this sound like a MAF Sensor? I'm not getting any stalling tendencies though, at least so far.

As the teacher in Ferris Bueller's Day Off said, "Anyone...? Anyone...?"

I'd really rather avoid Benjamin Dover at the dealer, if possible!

Thanks for sharing your ideas!