GM 19178934
Oxygen Sensor

Requirements for servicing the Oxygen Sensor include using the right tool, dealing with the sensor with care and ensuring the heated Oxygen Sensor (HO2S), the louvered end and all connectors are not contaminated. Do not take the pigtail off the ho2s or Oxygen Sensor (02S), since this will reduce the sensor's effectiveness. In case the pigtail, connector or terminal is broken, you should replace the Oxygen Sensor, since it's best not to fix these types of problems yourself. Contact cleaner should not be applied to the sensor or to the connector harness and the sensor pigtail and harness wires should not be exposed or bent, as this might result in problems with performance. Leave the Oxygen Sensor ground wire in place, because it could be essential for the sensor and double-check the seal on the connector in order to avoid water getting inside the wiring. It may be hard to remove the ho2s if the engine is not warm enough and applying strong force might damage the threads in the exhaust system. At first, remove the negative Battery Cable and then lift the vehicle before taking out the ho2s sensor connector heat shield, if it exists. Remove the ho2s sensor harness next and then take out the heated Oxygen Sensor using the j 39194 wrench carefully. Coat the threads of the Oxygen Sensor with gm p/n 5613695 or an equivalent, put the sensor in place with the wrench and tighten to 41 n.m (30 lb ft). Afterward, install the ho2s sensor harness connector, fit a heat shield if it's required, lower the vehicle to the ground and place the negative Battery Cable back where it came from.

To replace the heated Oxygen Sensor (HO2S) for bank 1, be careful with the sensor and ensure that the in-line electrical connector and the louvered end do not have any grease, dirt or contaminants and that you don't use any cleaning solvents. When removing, too much force could damage the threads on the Exhaust Pipe, so it may be necessary to lower the exhaust system to gain easier access. Start by lifting the vehicle and trace out the position of the ho2s to be eliminated. Remove the ho2s electrical connector and carefully remove the sensor. Use the gm p/n 5613695 anti-seize compound on the threads if necessary, as the compound is made up of graphite and glass beads, which make it easy to remove them in the future when installing a new or service sensor. Attach the heated Oxygen Sensor as well as tighten the same to 41 n.m (30 lb ft), followed by reconnection of the ho2s electrical connector, and then lower the vehicle.

Raise the vehicle.

The HO2S may be difficult to remove if the engine temperature is below 48°C (120°F).

Install the HO2S using the Oxygen Sensor Wrench (J 39194-B) and tighten it to 42 N.m (31 lb ft).

Disconnect the connector for the HO2S.

Carefully remove the heated oxygen sensor connector and then use the J 39194 Oxygen Sensor Wrench (J 39194) to remove the heated oxygen sensor (HO2S).

Reconnect the electrical connector and lower the vehicle.

Coat the threads with anti-seize compound GM P/N 5613695.

Disconnect the connector for the HO2S.

Remove the HO2S using the Oxygen Sensor Wrench (J 39194-B).

It consists of liquid graphite and glass beads to facilitate future removal.