Doesn't it come on every time you start?

If you are under there, you should replace all the warning lights as they are probably all the same age...maybe even the dash lights (3, I think).

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1991 300 SEL
218,000 Km

"Xsbank's rules of mechanical intervention: Always go for the easiest solution first; 90% of what ails a gasoline engine is ignition; After that its all a WAG."