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What is the procedure for resetting the check engine light
A Check Engine light should only be reset after a repair has been made, otherwise it will come back on.
A scan tool can reset it, or removing power to the engine control module may do it as well.
Q&A > Mercedes-Benz > 1990 Mercedes-Benz 300E
Q&A > Mercedes-Benz > 1991 Mercedes-Benz 300E
Q&A > Mercedes-Benz > 1992 Mercedes-Benz 300E