Jeep 5149171AA Oxygen Sensor

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Oxygen sensors are delicate, so handle them carefully. For the 2.4L engine (2014 and earlier), the upstream sensor is near the exhaust manifold, while on all other engines, the left and right upstream sensors are at the top of the catalytic converters. The downstream sensors are on the side of each catalytic converter. To remove the sensor, disconnect the wire harness and connector, and 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.

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.

For the 2.4L engine (2014 and earlier), the upstream sensor is located near the exhaust manifold, while on all other engines, the left and right upstream sensors are located at the top of the catalytic converters. The downstream sensors are located on the side of each catalytic converter.

It is advisable to start the engine briefly to ease the removal of the oxygen sensor due to exhaust pipe contraction. Upstream sensors are accessed from below the vehicle, while downstream sensors are located behind the catalytic converters. When replacing a sensor, clean the threads and apply anti-seize compound if reusing an old sensor, but do not apply it to new sensors as they come pre-coated.

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.

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 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.

Disconnect the connector mounting clips, raise the vehicle and support it securely on jackstands, disconnect the connector from the engine wiring harness, and remove the sensor from the catalytic converter.

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.

No, the emission maintenance timer cannot be reset. It must be replaced or disconnected to turn out the indicator light.

RIGHT 5149171AA LEFT 5149180AA SAME PART NUMBERS ARE USED FOR UPSTREAM OR DOWNSTREAM. ONLY SIDE OF THE VEHICLE MATTERS FOR THIS PARTICULAR PART NUMBER.