The crankshaft position sensor monitors the speed at which the crankshaft turns. Correct readings are a must to adjust for precise spark timing. If your sensor fails, or is giving inaccurate or inconsistent readings, this will result in poor performance and fuel economy. Even a minor malfunction can have serious implications. Replacing the sensor with a high-quality part ensures your motor will run smoothly, enjoying peak performance and efficiency. Manufactured by original equipment supplier to BMW, Hella.