Notice: Do not remove the pigtail from either the heated oxygen sensor (HO2S) or the oxygen sensor (O2S). Removing the pigtail or
the connector will affect sensor operation.
Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the in-line electrical 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, connector or terminals. Replace the oxygen sensor if the pigtail wiring, connector, or terminal is damaged.
This external clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors, or terminals could result in the obstruction of the air reference and degraded sensor performance.
The following guidelines should be used when servicing the heated oxygen sensor:
| • | Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance. |
| • | Do not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. |
| • | Ensure the sensor or vehicle lead wires are not bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire. |
| • | Do not remove or defeat the oxygen sensor ground wire, where applicable. Vehicles that utilize the ground wired sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will cause poor engine
performance. |
| • | Ensure that the peripheral seal remains intact on the vehicle harness connector in order to prevent damage due to water intrusion. The engine harness may be repaired using Packard's Crimp and Splice Seals Terminal Repair Kit. Under no circumstances
should repairs be soldered since this could result in the air reference being obstructed. |
Removal Procedure
The heated oxygen sensor may be difficult to remove when engine temperature
is below 48°C (120°F). Excessive force may damage threads in exhaust
manifold or exhaust pipe.
- If HO2S 2 is being replaced, raise the vehicle.
- Disconnect the electrical connector.
Important: A special anti-seize compound is used on the heated oxygen sensor
threads. The compound consists of graphite suspended in fluid 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 an engine and if for any reason
is to be reinstalled, the threads must have anti-seize compound applied
before reinstallation.
- Carefully back out the heated oxygen sensor.
Installation Procedure
- Coat the threads of heated oxygen sensor/catalyst monitor with anti-seize
compound P/N 5613695, or equivalent if necessary.
- Install the Heated Oxygen Sensor.
Tighten
| • | Tighten the H02S 1 (Pre-catalytic converter) to 42 ±4 N·m
(31 lb ft). |
| • | Tighten the H02S 2 (Post-catalytic converter) to 42 ±4 N·m
(31 lb ft). |
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.
- Connect the electrical connector.
