GM 19209814
Oxygen Sensor

The replacement of heated Oxygen Sensor (HO2S) 1 requires an Oxygen Sensor wrench (J 39194) tool for the task. Start by unsecured the fuel injection sight shield before cutting the ignition power supply. Begin by disconnecting the ho2s retaining clip from the bracket. After that disconnect the ho2s electrical connector tab from the retaining clip then remove the electrical connector retainer. Use the Oxygen Sensor wrench (J 39194) to unscrew the sensor whereas the vehicle sits on stands before extracting the rear Oxygen Sensor carefully from the rear Exhaust Manifold. An Oxygen Sensor removal becomes more challenging when temperatures exceed 48°c (120°F). Installation of the rear Oxygen Sensor requires manual insertion into the rear Exhaust Manifold with special anti-seize compound applied to threads either from new sensor components or your alternative p/n 5613695 compound. The sensor coating procedure requires anti-seize compound p/n 5613695 or equivalent for reused sensors but new service sensors arrive with this compound already applied. Mount the rear ho2s by applying 41 n.m (30 lb ft) torque before lowering the vehicle and reattaching the ho2s electrical connector. Connect the ho2s electrical connector tab to the bracket followed by the electrical connector retainer installation alongside reinstallation of the fuel injection sight shield.

Handle the HO2S and the O2S carefully, keeping the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants, and avoid using any cleaning solvents or dropping the sensors.

Coat the threads with anti-seize compound GM P/N 12377953 or an equivalent before installation.

Remove the splash shield.

Take care not to damage the threads in the exhaust manifold/pipe, as excessive force may cause damage.

Install the HO2S and tighten it to 1 to 42 N.m (31 lb ft), then reconnect the oxygen sensor electrical connector.

Apply anti-seize compound P/N 5613695 or equivalent to the threads if reusing a sensor, and tighten it to 2 to 42 N.m (31 lb ft).

Lower the vehicle, reconnect the engine harness electrical connector to the HO2S pigtail, install the HO2S pigtail clip to the sight shield bracket, and reinstall the intake manifold cover.

If the engine temperature is below 48°C (120°F), the oxygen sensor may be difficult to remove.

Begin by removing the fuel injection sight shield and turning off the ignition switch.

It is important to remove oxygen sensors with the engine temperature above 48°C (120°F) to avoid difficulty.

Gather the necessary tools, including the Oxygen Sensor Wrench (J 39194).

Damage to the in-line electrical connector and the louvered end can impair sensor functionality.

Yes, new service sensors should already have this compound.

Oxygen Sensor Wrench (J 39194).

Use the Oxygen Sensor Wrench (J 39194) to remove the HO2S from the exhaust pipe.

Disconnect the electrical connector of the HO2S 1.

Ensure that the special compound, which consists of graphite and glass beads, is applied if the sensor has been previously removed.

Carefully remove the rear oxygen sensor from the rear exhaust manifold using the Oxygen Sensor Wrench (J 39194).