The Nitty Gritty: :: 1989 740 Turbo Wagon :: Automatic Transmission :: 187,000 miles :: Purchased used at 185,000 miles :: Driven regularly without incident :: "Service Engine" light began illuminating when car was started, but would go out once car warmed up or was driven for approx. 1 mi...

[quote="vtrucker"]It is an
automatic,the upshift light stays on.[/quote]

I would suggest replacing the OverDrive Relay and/or checking the overdrive button on the shifter knob (could be sticking).

Had a similar problem in an '88 240DL, replaced the OD Relay, and the problem was solved.