Rear Heated Oxygen Sensor (HO2S 2)

Caution: The Rear Heated Oxygen Sensor (HO2S 2) uses a permanently attached pigtail and connector. This pigtail should not be removed from the oxygen sensor. Damage or removal of the pigtail or connector could affect proper operation of the oxygen sensor.

Figure 3A-12 Rear Heated Oxygen Sensor (HO2S 2):

Legend:
1. HO2S2
2. Catalytic Converter

CAUTION: Take care when handling the HO2S 2. The in-line electrical connector and louvered end like the O2S 1 must be kept free of grease, dirt or other contaminants. Also, avoid using cleaning solvents of any type. DO NOT drop or roughly handle the HO2S 2.

REMOVE OR DISCONNECT
1. Ignition "OFF"
2. HO2S 2 electrical connector.
3. Carefully remove the rear heated oxygen sensor.

CAUTION: Excessive force may damage the threads in the exhaust pipe.

INSTALL OR CONNECT

NOTE: A special anti-seize compound is used on the HO2S 2 sensor threads. The compound consists of a liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If the sensor is removed from the exhaust, and if for any reason it is to be reinstalled, the threads must have an anti-seize compound applied before reinstallation.

1. Coat the threads of the HO2S 2 with anti-seize compound.
2. HO2S 2.

Tighten The HO2S 2 to 41 Nm (30 ft. lbs.).

3. HO2S 2 electrical connector.