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Q: Engine light come on often and goes out on 2000 Mercedes-Benz E430

Why does the engine light come on and go off?
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This can happen for a number of reasons. Check out the RepairPal article on the check engine light: and also the common problems page for your car:

You may find what you need there.
It is a warning light that is illuminated when there is a problem with the EMISSION SYSTEM only. Emission system being the pollution control system.
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