Heated Oxygen Sensors (H02S) - Replacing
Section2
Group
25
No.
0018
Year
99
Month
12
Cars
S80
1999-
Vehicles Involved: B6284T, B6294F
Replacing heated oxygen sensors (HO2S)
Background:
Updated method for replacing heated oxygen Sensors (HO2S).
Replacing heated oxygen sensors (HO2S) Special tools: 999 5543
1
Removal
Warning!
The exhaust system and three-way catalytic converter (TWC) may be very hot.
Warning!
Use protective goggles when drilling.
Removing the center member
Remove the screws.
Drill out the rivets.
Remove the center member.
Remove the flange between the exhaust pipe and three- way catalytic converter (TWC).
Remove the rubber pads for the exhaust pipe mounting on the rear member.
Pull the rubber pads from the mounting points. This is so that the boots on the three-way catalytic converter (TWC) will not be damaged.
Caution!
Ensure that the mobile jack does not damage the three-way catalytic converter (TWC). Exhaust emissions may be affected if the three-way catalytic converter (TWC) is damaged.
Removing the front member
Carefully position the mobile jack under the three-way catalytic converter (TWC).
Pull the rear exhaust system backwards so that the joint at the three-way catalytic converter (TWC) separates by 50 mm (2.0").
Remove the four screws.
Drill out the two rivets.
Turn the member.
Remove the two screws.
Unhook the brake pipes.
Remove the clamps for the cable harnesses.
Remove the member.
Lower the rear edge of the three-way catalytic converter (TWC) 120 mm (4 3/4").
Remove the heat deflector plate.
When replacing the left heated oxygen sensor (HO2S):
Remove the left front wheel.
- Separate the connector for the heated oxygen sensor (HO2S). Expose the cable harness.
Remove the heated oxygen sensor (HO2S).
Use tool 999 5543 See the illustration.
2
Installation
- Use tool 999 5543.
Install the heated oxygen sensor (HO2S). Tighten to 45 Nm (33 ft.lb).
- Install the mounting for the cable harness
- Route the cable harness. Connect the connector.
Caution!
Ensure that the cable harness does not rub and is not pinched.
- Install the heat deflector plate
- Carefully raise the mobile jack to the installation position for the exhaust system
- Install the front member. Tighten to 25 Nm (18 ft.lb).
Note!
Do not reinstall the rivets.
- Reconnect the exhaust flange. Tighten to 25 Nm (33 ft.lb).
- Install the center member. Tighten to 25 Nm (33 ft.lb).
Note!
Do not reinstall the rivets.
- Reinstall the rubber pads for the exhaust mounting. Tighten to 25 Nm (33 ft.lb.).
Caution!
Check that the exhaust system is not rubbing. Check that the exhaust system is not in contact with the bodywork or other components.
- Remove the mobile jack.
Finishing
Start the engine. Check that the exhaust system does not leak at the flange.
WARRANTY STATEMENT: Claims may be submitted under the New Car Warranty when there is a documented customer complaint, using claim type 01.
Labor description Time allowance
25412-2 Replacing heated oxygen sensors (HO2S) Right 1.0 hr
Left 1.1 hr