Jeep 56029085AA Oxygen Sensor

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Special care must be taken when servicing an oxygen sensor. The upstream 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 downstream sensor is 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 should be cleaned and anti-seize compound should be applied to the threads if reusing the old sensor. The sensor should be installed and tightened securely. The installation process is the reverse of removal.

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.

The emission maintenance timer is located under the instrument panel, to the right of the steering column.

For the crankshaft reference sensor, unplug the electrical connector, loosen the retaining bolt, remove the sensor, and if reinstalling, remove the old spacer and install a new one.