GM Genuine Parts 12638266 Engine Camshaft Position Sensor with Bolt, Retainer, Seal and Sensor;

An ACDelco GM Original Equipment Engine Camshaft Position Sensor monitors the rotational position of the camshaft(s), and is a GM-recommended replacement for your vehicle’s original component. It provides a signal to the engine control module, which compares the camshaft position with the crankshaft position to determine ignition and fuel injection timing. This original equipment engine camshaft position sensor has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.