Jeep 56029050AA Oxygen Sensor

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Oxygen sensors play a vital role in monitoring the air/fuel ratio and catalytic converter efficiency. There are four sensors, two upstream in the exhaust manifolds and two downstream behind the converters. The pre-converter sensor provides feedback to the PCM to adjust the fuel injector pulse width and control the air/fuel ratio. The post-converter sensor monitors the efficiency of the converter. An oxygen sensor requires good electrical connections, proper air circulation, correct operating temperature, and unleaded fuel to function correctly. When replacing a sensor, use an oxygen sensor socket and clean the threads before installation. After replacing, disconnect the battery for a few minutes to allow the PCM to learn the new sensor.

To remove the camshaft reference sensor on 3.3L and 3.8L models, detach the sensor lead, loosen the bolt, and remove the sensor. If reusing, clean the sensor face and replace the spacer and O-ring. To install a new sensor, ensure it has a paper spacer and mount the O-ring. For the charge temperature sensor, unplug the connector, replace the sensor, and secure it with tape. For the coolant sensor, replace the cap, and the sensor, and check the coolant level. For the crankshaft sensor, unplug the connector, loosen the bolt, remove the sensor, and replace the spacer if reusing. For the TPS, check resistance readings, and replace if it is incorrect.

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.

The ideal ratio for minimum emissions and fuel economy is 14.7 parts air to 1 part fuel.

To replace the oxygen sensor, raise the vehicle, locate the sensor and disconnect the electrical connector, remove the sensor using a wrench or oxygen sensor socket, clean the threads, and apply anti-seize compound if reusing the old sensor. Installation is the reverse of removal.

The procedure for replacing the oxygen sensor is detailed in another part of the manual.

To replace the oxygen sensor, raise the vehicle, locate the sensor and disconnect the electrical connector, remove the sensor using a wrench or oxygen sensor socket, clean the threads, and apply anti-seize compound if reusing the old sensor. Installation is the reverse of removal.