Jeep 56029049AA Oxygen Sensor

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The oxygen sensor in a vehicle's exhaust system reacts with the oxygen to produce a voltage output that varies depending on the oxygen content. This feedback signal is used by the PCM to determine the required fuel injector pulse width and control the air/fuel ratio. The pre-converter oxygen sensor provides this feedback, while the post-converter sensor is used to monitor the efficiency of the catalytic converter. The PCM operates in an open-loop fuel control mode until the sensor reaches its operating temperature of around 600 degrees F. The sensor requires good electrical connections, air circulation, correct operating temperature, and unleaded fuel to operate correctly. The PCM can detect sensor problems and set Diagnostic Trouble Codes. 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 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.

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.

Disconnect the oxygen sensor wire harness mounting clips, disconnect the oxygen sensor connector from the engine wiring harness, and remove the sensor from the exhaust pipe or catalytic converter. For V6 engines, raise the vehicle and disconnect the electrical lead from the oxygen sensor, then unscrew the sensor using a special oxygen sensor socket. Clean the threads of the sensor bore if reusing the old sensor, and apply anti-seize compound to the threads if necessary. Install the sensor and tighten it to the specified torque. For the 2.4L engine (2015 and later), trace the electrical lead from the upstream or downstream oxygen sensor to the electrical connector and disconnect it. Remove the wiring harness metal protector piece if equipped, then unscrew the sensor using a special oxygen sensor socket. Apply anti-seize compound to the threads if necessary, and install the sensor following the specified torque.

The oxygen sensor needs good electrical connections, sufficient air supply, to reach the correct operating temperature, and to use unleaded fuel in order to operate correctly.

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.

When replacing the sensor, precautions should be taken to avoid damage or contamination. The sensor should be installed using anti-seize compound on the threads.

The oxygen sensor in the exhaust system reacts with the elements to produce a voltage output that varies based on the amount of oxygen in the exhaust. This feedback signal is used by the PCM to determine the required fuel injector pulse width and control the air/fuel ratio.

To remove the emission maintenance timer, unplug the electrical connector, remove the screws, and lower the timer from the instrument panel. Installation is the reverse of removal.

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.