I was in a hurry, and brain not fully engaged, while changing the battery in my wifes '89 560SEL and didn't notice the posts on the (wrong) replacement battery were reversed. So the car was hooked up with reverse polarity for a brief instant. Sparks told me at the first touch that it was wrong.

Luckily it still starts and runs. The ABS light is on, the Check Engine light seems to be non-functional (possibly burned out bulb) and the car is idling at about 1800 rpm. Otherwise all the systems seem to work.

How do I get diagnostic information from the car so I can figure out what I need to replace?

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Tom Gentry
'89 Mercedes-Benz 560 SEL
'96 SVT Mustang Cobra (Mystic #1345)
Life is too short to drive boring cars!