Mercedes-Benz C-Class & E-Class EGR Valve OM646 CDI A6461400760 (2000-2011)

Mercedes diesel ECUs are incredibly sensitive to the electrical signals sent by the EGR valve's position sensor. Cheaper aftermarket valves frequently use low-quality electronics that send slightly inaccurate voltages back to the computer. Even if the valve physically opens and closes, this voltage discrepancy will trigger a Check Engine Light.

The valve itself is plug-and-play, but you should use a Mercedes STAR diagnostic system (or an advanced OBD2 scanner) to clear the old fault codes. It is also highly recommended to reset the "EGR Adaptation Values" in the ECU so the computer can learn the precise stopping points of the brand-new valve.

Yes! A stuck EGR valve causes your engine to run excessively rich, producing massive amounts of heavy soot. If left unaddressed, this excess soot will rapidly clog your expensive Diesel Particulate Filter (DPF) and catalytic converter.

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