Heated Oxygen Sensor (HO2S) 2 Replacement
Tools Required
SA9603E Oxygen Sensor
Wrench Remover/Installer
Removal Procedure
Caution
Ensure that the vehicle is properly supported and squarely positioned.
To help avoid personal injury when a vehicle is on a hoist, provide additional support
for the vehicle on the opposite end from which the components are being removed.
- Raise the vehicle.
Notice
Do not apply grease or silicon products to the heated oxygen sensor (H02S-2).
Do not alter the wiring in any way. The wires carry air reference to the sensor.
- Remove the HO2S-2 wiring harness from the frame by pushing up
on the retaining clip tab.
- Remove the connector position assurance (CPA) device and disconnect the HO2S-2
harness connector.
- Remove the HO2S-2 wiring harness from the trough in the converter heat shield
by gently pulling the wiring harness from its retaining clips.
Important
The HO2S-2 uses a permanently attached pigtail and connector. This pigtail should
not be removed from the sensor. Damage or removal of the pigtail or connector will
affect proper operation of the sensor.
- Remove the HO2S-2 using the
SA9603E
. If necessary, use a liquid penetrate before removing the sensor.
Installation Procedure
Notice
When reinstalling an existing sensor, always use an anti-seize compound (Saturn
P/N 21485279 or equivalent) on the threads of the oxygen sensor. Never use
silicone products. They will contaminate the sensor. A new Saturn service replacement
sensor already has a sufficient amount of anti-seize compound and does not require
any additional compound to be added.
- Install the HO2S-2 using the
SA9603E
.
TightenTighten the oxygen sensor-to-exhaust manifold 45 N·m (33 lb ft).
Important
Ensure the marker tape is centered with the edge of the trough to ensure enough
slack in the harness.
- Install the HO2S-2 harness into the retaining clips in the trough in the converter
heat shield.
- Connect the HO2S-2 harness connector. Push in the connector until a click is
heard and pull back to confirm a positive engagement.
- Install the connector position assurance (CPA) device in the harness connector.
- Install the HO2S-2 wiring harness retaining clip into the cradle.
- Lower the vehicle to start the engine.
- Check for leaks.