Mopar 56029050AA Oxygen Sensor

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The oxygen sensors in a vehicle play a crucial role in monitoring the air/fuel ratio and the efficiency of the catalytic converter. There are four oxygen sensors, with two upstream sensors located in the exhaust manifolds and two downstream sensors located behind the catalytic converters. The pre-converter oxygen sensor provides feedback to the PCM about the amount of leftover oxygen in the exhaust, allowing the PCM to adjust the fuel injector pulse width and control the air/fuel ratio. The ideal ratio for minimum exhaust emissions and fuel economy is 14.7 parts air to 1 part fuel. The post-converter oxygen sensor, although not used for air/fuel ratio control, is used by the PCM to monitor the efficiency of the catalytic converter. An oxygen sensor operates within a specific temperature range and requires good electrical connections, proper air circulation, correct operating temperature, and unleaded fuel to function correctly. The PCM can detect oxygen sensor problems and set Diagnostic Trouble Codes (DTCs) to indicate specific faults. When replacing an oxygen sensor, it is important to use an oxygen sensor socket and clean the threads before installation. Anti-seize compound should be applied to the threads if reusing the old sensor, but not if installing a new sensor. After replacing the sensor, it is recommended to disconnect the battery for a few minutes to allow the PCM to learn the characteristics of the new sensor.

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.

The camshaft reference sensor on the 3.3L and 3.8L engines requires a special factory tool (DRB-I) for diagnosis. To replace it, first, unplug the sensor lead at the electrical connector and loosen the retaining bolt. Remove the sensor from the cylinder head. If reinstalling the same sensor, remove the old spacer, clean the sensor face, and install a new spacer and inspect the O-ring. For a new sensor, ensure a new paper spacer is already installed, and the O-ring is properly positioned. Apply oil to the O-ring before installation, push the sensor down to contact the cam timing gear, and tighten the retaining bolt. For the charge temperature sensor, unplug the electrical connector, unscrew the sensor, coat the threads of the new sensor with tape, and install it securely. For the coolant temperature sensor, open the radiator cap, squeeze the upper radiator hose, reinstall the cap, unplug the electrical connector, unscrew the sensor, coat the threads of the new sensor, install it securely, and check the coolant level. 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. Finally, 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. For the Throttle Position Sensor (TPS), disconnect the electrical connector, use a digital ohmmeter to check the resistance readings while moving the throttle lever, and replace the TPS if readings are incorrect. Then, follow the steps for replacement, including removal of the air cleaner assembly for the 2.5L engine, unplugging the electrical connector, removing the screws retaining the TPS, and reinstalling it securely.

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.