Mopar 4727436AB Oxygen Sensor

The process for replacing the downstream oxygen sensor is similar, with the sensor located on the side of the catalytic converter. The electrical lead should be traced and disconnected, and then the sensor can be unscrewed. The threads of the sensor bore in the catalytic converter should be cleaned, and if reusing the old sensor, anti-seize compound should be applied to the threads. If installing a new sensor, anti-seize compound is not necessary. The downstream oxygen sensor should be installed and tightened securely. The installation process is the reverse of removal for both sensors.

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.

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.