Mopar 4686938AB Oxygen Sensor

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The upstream oxygen sensor is located on top of the exhaust manifold for 2.4L four-cylinder engines and on top of the rear exhaust manifold for 3.3L/3.8L V6 engines. The electrical lead should be traced and disconnected from the upstream oxygen sensor, and then the sensor can be unscrewed using a special oxygen sensor socket. After removing the old sensor, the threads of the sensor bore in the exhaust manifold should be cleaned. If reusing the old sensor, anti-seize compound should be applied to the threads for future removal. If installing a new sensor, anti-seize compound is not necessary as the threads already have it. The upstream oxygen sensor should be installed and tightened securely.

For the throttle body temperature sensor, remove the air cleaner, disconnect throttle cables, remove the accelerator cable bracket, unplug the electrical connector from the sensor, remove the sensor, apply heat transfer compound, install the sensor securely, and reverse the steps for reinstallation.

The pigtail and electrical connector of the sensor are permanently attached and cannot be removed without damaging the sensor. It is important to keep grease, dirt, and other contaminants away from the electrical connector and the louvered end of the sensor. Cleaning solvents should not be used on the sensor. Rough handling or dropping of the sensor should be avoided.