On V6 models, there are two CMP sensors located on the inside walls of the cylinder heads, adjacent to the timing rotor installed on the front of each Variable Valve Timing-intelligent (VVT-i) controller. For four-cylinder models, the CMP sensor is positioned on the front of the cylinder head, adjacent to the intake camshaft timing belt sprocket. Begin by disconnecting the cable from the negative battery terminal. Next, remove the accessory drivebelt. Disconnect the CMP sensor electrical connector by depressing the release tab and then removing the connector, followed by the removal of the sensor retaining bolt. After that, remove and discard the old CMP sensor O-ring. Installation is the reverse of removal, ensuring that the CMP sensor retaining bolt and stud are tightened securely.