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The MEAT & DORIA 87121 Crankshaft Position Sensor is a critical component for modern engine management systems. It accurately detects the rotational speed and position of the crankshaft, sending this vital information to the engine control unit (ECU). This data is essential for the ECU to precisely control ignition timing and fuel injection, optimizing engine performance, fuel efficiency, and emissions. A malfunctioning sensor can lead to rough idling, stalling, poor acceleration, and the illumination of the check engine light. Designed as a direct replacement for the original equipment, the 87121 sensor ensures seamless integration and reliable operation. Its robust construction is built to withstand the harsh conditions found within the engine bay, providing long-lasting durability. Proper functioning of the crankshaft position sensor is fundamental to your vehicle's overall health and drivability. Replacing a faulty sensor with a quality part like the MEAT & DORIA 87121 can restore optimal engine performance and prevent further issues.