Oxygen Sensor: Service and Repair
Heated oxygen sensor (HO2S), replacing
Replacement of heated oxygen sensors, cylinder 2, 4, 6 and 8 (bank 2)
Special tools:
999 5543 SOCKET NV-22 HO2S 999 5543 Socket NV-22 HO2S
Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.
Removal
Removing the lower engine cover
Raise the vehicle: Jacking points, body Service and Repair.
Remove:
- the 6 screws
- the lower engine cover.
Removing the rear heated oxygen sensor
Unplug the connector of the rear heated oxygen sensor. Remove the oxygen sensor using 999 5543 SOCKET NV-22 HO2S 999 5543 Socket NV-22 HO2S.
Removing intermediate pipes
Remove:
- the 8 nuts
- the 2 intermediate pipes. Scrap the 4 gaskets.
Unplugging the connector of the front heated oxygen sensor
Remove the front heated oxygen sensor using tool 999 5543 SOCKET NV-22 HO2S 999 5543 Socket NV-22 HO2S.
Installation
Note! To ensure that there is no exhaust leakage, see: Flanged joint, assembling Removal and Replacement.
Installing the front heated oxygen sensor
Install the front heated oxygen sensor using 999 5543 SOCKET NV-22 HO2S 999 5543 Socket NV-22 HO2S. Tighten as specified: Tightening torque, B8444S [1][2]Specifications. Plug in the connector of the front heated oxygen sensor. Position the connector in the retainer.
Installing intermediate pipes
Install:
- new4 gaskets
- the 2 intermediate pipes
- the 8 nuts; tighten.
Installing the rear heated oxygen sensor
Install the rear heated oxygen sensor using 999 5543 SOCKET NV-22 HO2S 999 5543 Socket NV-22 HO2S. Tighten as specified: Tightening torque, B8444S [1][2]Specifications. Plug in the connector of the rear heated oxygen sensor. Position the connector in the retainer.
Installing the lower engine cover
Install:
- the lower engine cover
- the 6 screws; tighten.
Replacement of heated oxygen sensors, cylinder 1, 3, 5 and 7 (bank 1)
Removal
Removing protective plate
Note! There is a guide sleeve on the upper mounting for the plate. This must be lifted slightly so that the panel can be slid forward.
Remove the 6 screws. Lift and slide the protective plate forward. Remove the protective plate.
Removing the lower engine cover
Remove:
- the 6 screws
- the lower engine cover.
Removing the front heated oxygen sensor
Unplug the connector of the front heated oxygen sensor from above. Remove the front heated oxygen sensor using 999 5543 SOCKET NV-22 HO2S 999 5543 Socket NV-22 HO2S
Removing the rear heated oxygen sensor
Unplug the connector of the front heated oxygen sensor from above. Remove the oxygen sensor using 999 5543 SOCKET NV-22 HO2S 999 5543 Socket NV-22 HO2S.
Installation
Note! To ensure that there is no exhaust leakage, see: Flanged joint, assembling Removal and Replacement.
Installing the front heated oxygen sensor
Install the front heated oxygen sensor using 999 5543 SOCKET NV-22 HO2S 999 5543 Socket NV-22 HO2S. Tighten as specified: Tightening torque, B8444S [1][2]Specifications. Plug in the connector of the front heated oxygen sensor. Position the connector in the retainer.
Installing the rear heated oxygen sensor
Install the rear heated oxygen sensor using tool 999 5543 SOCKET NV-22 HO2S 999 5543 Socket NV-22 HO2S. Tighten as specified: Tightening torque, B8444S [1][2]Specifications. Plug in the connector of the rear heated oxygen sensor. Position the connector in the retainer.
Installing the lower engine cover
Install:
- the lower engine cover
- the 6 screws; tighten.
Installing the protective plate
Install:
- the protective plate
- the 6 screws; tighten.
Erase Diagnostic Trouble Codes (DTCs).
Reset trim.