Buick 12636947 Sensor Assembly, Camshaft Position

1.5L engines utilize two CMP sensors, one for the intake camshaft located at the left-rear corner of the valve cover and another for the exhaust camshaft positioned on the top of the left-front corner of the valve cover. In 2.0L and 2.5L engines, the intake sensor is found at the left end of the cylinder head above the transaxle, while the exhaust sensor is on the left front side of the cylinder head. Begin by removing the engine cover. For 2.0L engines, access the intake CMP sensor by removing the turbocharger ducting between the throttle body and the charge air cooler. On all models, depress the tab to disconnect the CMP sensor electrical connector. Next, remove the CMP mounting bolt and take out the sensor. Inspect the CMP sensor O-ring and replace it if damaged. Installation follows the reverse order of removal; lubricate the O-ring with a film of clean engine oil and securely tighten the CMP sensor bolt.

For the 1.8L engine, the camshaft position sensors are located at the rear of the cylinder head, with the intake sensor nearest to the firewall and the exhaust sensor closest to the radiator.