For 1990-2009 cars

### Removal Procedure

Caution: Refer to Battery Disconnect Caution in the Preface section.

1. Disconnect the negative battery cable.

Notice: Refer to Heated Oxygen and Oxygen Sensor Notice in the Preface section.

Notice: Do not solder heated oxygen sensor wires. Soldering the wires will result in the loss of the air reference to the sensor. Refer to Engine Electrical for proper wire and connection repair techniques.

2. Disconnect the electrical connector.
3. Remove the heated oxygen sensor (HO2S) 2.

### Installation Procedure

Important: A special anti-seize compound is used on the oxygen sensor threads. This 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 a sensor is removed from any engine and if for any reason it is to be reinstalled, the threads must have anti-seize compound applied before reinstallation.

1. Coat the threads of the HO2S 2 with an anti-seize compound, if needed.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the HO2S 2.

Tighten
Tighten the heated oxygen sensor to 42 N·m (31 lb ft).

3. Connect the electrical connector.
4. Connect the negative battery cable.