re: 1992 300E 2.6 w/83,000 miles
The warning light indicating a bad headlight/brake light etc. comes on upon turing on my headlights....but I have checked all lights and everything seems in order.
Any suggestions?

hmm, we get this quite a lot. Make sure all lights, including the license plate lights are okay. Incorrect bulb types also cause the light, so it's worth checking those.

later

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg

Check all the bulbs again. make sure they all the correct wattage - tail lights are 10W on these cars. Then check for corrosion in the bulb holders.

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Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)