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If you're driving your 2007 Mercedes S550 and the check engine light illuminates on the dashboard, the first step is to pull over to a safe location promptly. Once stopped, utilize an OBD II scan tool to retrieve the error code stored in the ECU responsible for triggering the light. The reasons for the light turning on vary widely, ranging from a minor issue like a loose gas cap to a more serious ECU malfunction. Without using a scan tool, it's difficult to determine the exact cause.
A couple of possible causes for the 2007 Mercedes-Benz S550's check engine light turning on include a malfunctioning fuel injector or a cap on the gas tank that's not securely fitted.