For 1990-2009 cars

### Removal Procedure

#### Tools Required

J 39194-B Heated Oxygen Sensor Wrench

Notice: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.

Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.

Notice: Remove oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.

Notice: A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.

Notice: The use of excessive force may damage the threads in the exhaust manifold/pipe.

The heated oxygen sensor may be difficult to remove when engine temperature is below 48°C (120°F).

1. Disconnect the electrical connector.
2. Carefully back out the heated oxygen sensor.

### Installation Procedure

1. Coat the threads of heated oxygen sensor with anti seize compound, or equivalent if necessary.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the Heated Oxygen Sensor.

Tighten
Tighten the H02S 1 (Pre-catalytic converter) to 42N·m (31 lb ft).

3. Connect the electrical connector.