GM 96418965
Oxygen Sensor

The first step to replace a heated Oxygen Sensor at position 2 begins with disconnecting the negative Battery Cable after properly following safety precautions. Keep the electrical connector plug attached to both the heated Oxygen Sensor (HO2S) unit and the Oxygen Sensor (O2S) unit when performing removal to maintain sensor functions. Treat the Oxygen Sensor with care and maintain the in-line electrical connector and louvered end free from contaminants while avoiding all cleaning solutions. The replacement of a damaged Oxygen Sensor becomes necessary when any damage is present in the pigtail wiring or connector or terminal since such conditions can hinder the sensor's airflow reference and reduce its operational capabilities. The use of contact cleaner on the sensor and its connectors can damage both the sensor pigtail and the harness wires besides causing deformation of lead wires or removal of the ground wire to result in performance issues. The peripheral seal on vehicle harness connectors must be checked for complete integrity to block water entry and packard's crimp and splice seals terminal repair kit should be used for engine harness repairs rather than soldering procedures. Before installing the heated Oxygen Sensor 2 (HO2S2) apply a special anti-seize compound made of liquid graphite and glass beads to its threads because the mixture helps future removal. After installation the technician should tighten the ho2s2 to 42 n.m (31 lb ft) before reattaching the electrical connector followed by the negative Battery Cable.

The in-line electrical connector and the louvered end should be kept free of contaminants.

Ensure the engine temperature is above 48°C (120°F) for easier removal.

First, disconnect the negative battery cable, ensuring safety precautions are followed.