For four-cylinder models from 1999 through 2005, the CKP sensor is located on the front of the engine, behind the timing belt cover, next to the crankshaft sprocket. Begin by disconnecting the cable from the negative battery terminal, then remove the lower timing belt cover. Next, disconnect the sensor wiring harness, remove the two mounting bolts, and lift the sensor off. Installation follows the reverse order of removal. For all other models, the sensor is mounted near the driver's side of the engine, close to the flywheel/driveplate, toward the rear. Start by removing the intake air duct and any other components that may interfere. If equipped, remove the shield fasteners and the shield. Disconnect the sensor wiring harness from its retainer and the connector, then remove the CKP sensor mounting bolt and the sensor itself. If reinstalling the same sensor, ensure the O-ring is in good condition, and installation is the reverse of removal.