Wanted to give an update. I put the key in the ignition and turned it to on without started the engine. It seemed like all of the lights came on including the check engine light. When I start the car, the lights go off. Any ideas?

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.