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Hi Bill, no you cannot turn off the check engine light without a Mercedes scan tool. The check engine light is telling you that a malfunction has been detected in the engine management system. I'm afraid this will require a trip back to the dealer to have this corrected. It's possible that they did not get something fitted back properly under the hood and it has caused the check engine light to come on. They will need to read out the fault code stored in the engine control module and make any corrective action needed to keep the light from coming back on again.
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Just to clarify, the check engine light is not the same as the service due light. The check engine light indicates a malfunction whereas the service due light is simply a service reminder.
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