For 1990-2009 cars

## Heated Oxygen Sensor Replacement Sensor 1

### Removal Procedure

Notice: The heated oxygen sensors each use a permanently attached pigtail and connector. Do not remove the pigtail from the heated oxygen sensor. Damage or removal of the pigtail or the connector affects proper operation of the heated oxygen sensor. Handle the oxygen sensor carefully. Do not drop the oxygen sensor. Keep the in-line connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type. Do not repair the wiring, the connector, or the terminals. Replace the oxygen sensor if the pigtail wiring, the terminals, or the connector is damaged. Proper oxygen sensor operation requires an external air reference. This external air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, the connectors, or the terminals results in the obstruction of the air reference and degrades the oxygen sensor performance. A dropped oxygen sensor is a bad oxygen sensor.

1. Disconnect the HO2S 1 electrical connector (2).
2. Remove the two HO2S 1 hold down nuts (3).
3. Remove the HO2S 1 (1) and gasket from the exhaust pipe.

### Installation Procedure

1. Install the HO2S 1 gasket onto the exhaust manifold.
2. Install the HO2S 1 (1) to the exhaust manifold.

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.

3. Install the two HO2S 1 hold down nuts (3).

Tighten
Tighten the HO2S 1 hold down nuts to 44 N·m (32 lb ft).

4. Connect the HO2S 1 electrical connector (2).

## Heated Oxygen Sensor Replacement Sensor 2

### Removal Procedure

Notice: The heated oxygen sensors each use a permanently attached pigtail and connector. Do not remove the pigtail from the heated oxygen sensor. Damage or removal of the pigtail or the connector affects proper operation of the heated oxygen sensor. Handle the oxygen sensor carefully. Do not drop the oxygen sensor. Keep the in-line connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type. Do not repair the wiring, the connector, or the terminals. Replace the oxygen sensor if the pigtail wiring, the terminals, or the connector is damaged. Proper oxygen sensor operation requires an external air reference. This external air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, the connectors, or the terminals results in the obstruction of the air reference and degrades the oxygen sensor performance. A dropped oxygen sensor is a bad oxygen sensor.

Important: The HO2S may be difficult to remove at temperatures above 48°C (120°F). Allow the engine to cool down before attempting to remove the HO2S. Use care in order to prevent any damage to the threads in the exhaust pipe.

1. Remove the front floor console. Refer to Front Floor Console Replacement .
2. Pull back the passenger side carpet from along the console floor area.
3. Disconnect the HO2S 2 electrical connector (1).
4. Remove the HO2S wiring from being under the floor heat duct.
5. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
6. Remove the wiring and the body plug (2) from the floor pan.
7. Remove the HO2S 2 (3) from the exhaust pipe.

### Installation Procedure

Important: The HO2S 2 comes with an anti-seize coating on the new sensor. Take precautions in order to prevent removal of any of this coating prior to installation.

1. Install the HO2S 2 (3) into the exhaust pipe.

Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

2. Tighten the HO2S 2.

Tighten
Tighten the HO2S 2 to 44 N·m (32 lb ft).

3. Install the wiring and the body plug (2) into the floor pan.
4. Lower the vehicle.
5. Pass the HO2S wiring under the heater floor duct.
6. Connect the HO2S 2 electrical connector (1).
7. Install the passenger side carpet back along the console area.
8. Install the front floor console. Refer to Front Floor Console Replacement .