GM 12575657
Oxygen Sensor

In order to replace the Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1, first remove the left side air inlet panel. Make sure the HO2S and the O2S are treated gently while maintaining the in-line electric connector and the louvered end clean of grease, dirt, contaminations, and never use in cleaning solvents. It should be noted that Bank 2 here means left bank and the removal is easier when the institution temperature will be more than 48°C (120°F. Unplug the HO2S connector and pull it out from the wiring harness bracket. Lift and hold the vehicle as you take out the HO2S. For installation, it is also required to apply anti-seize compound P/N 5613695, or an equal one to the threads of the used sensor, as new sensors which have to be used should already have this compound applied to it. Mount the HO2S and tighten it to 40 Nm (30 lb ft). Lower the vehicle then; Connect the HO2S electrical connector to the wiring harness bracket; Connect the said. Lastly, replace the left side air inlet panel.

To replace the heated Oxygen Sensor (HO2S) for bank 1 sensor 1, start by making sure the ignition is off. It is time to separate the ho2s and the electrical connection; this has to be detached from the wiring harness bracket. Lift and keep the vehicle off the ground without any risk. It is important to mention that it is easier to remove the Oxygen Sensor when the engine temperature is above 48°c (120°F). After a lot of caution, gently pull out the ho2s from the Catalytic Converter trying not to dismantle the permanently attached pigtail and connector. During the installation of the new or reused ho2s, confirm that the threads are covered with anti-seize compound p/n 5613695 or equivalent since a different anti-seize compound is used on the Oxygen Sensor threads. Mount the ho2s to the Catalytic Converter and tighten onto it 40 n.m (30 lb ft) of torque fitting. Lower the vehicle, install the ho2s electrical connector back to the wiring harness bracket and secure it to it.

The Oxygen Sensor Wrench (J 39194).

GM PIN 5613695 or equivalent.

Disconnect the HO2S electrical connector and remove it from the wiring harness bracket.

Turn the ignition OFF and raise and support the vehicle.

Ensure that it has a special anti-seize compound applied to the sensor threads; if reusing the original sensor, apply anti-seize compound GM P/N 5613695 or equivalent.

Ensure the ignition is turned OFF.

Remove the fuel injector sight shield and disconnect the oxygen sensor electrical connector from the engine wiring harness at the rear of the left head.

Raise and support the vehicle, then remove the oxygen sensor from the exhaust pipe.

Carefully remove the HO2S, taking care not to damage the permanently attached pigtail and connector.

First, remove the engine sight shield and the front air inlet housing panel.

Route and attach the wiring as noted during disassembly, reconnect the oxygen sensor electrical connector, and then lower the vehicle.