247319 Removing and installing oxygen sensor behind catalytic converter on DFI engines

WM 247319 Removing and installing oxygen sensor behind catalytic converter on DFI engines

Tools





Technical values






Preliminary work

CAUTION

Heavy components

- Risk of squashing

-> Wear personal protective gear.
-> Get someone to help if necessary.

CAUTION

Hot components

- Risk of burns

-> Let hot components cool down.
-> Wear personal protective gear.

1. Move bonnet to service position using lid prop 9704.
2. Put on the protection covers.
3. Remove right engine compartment cover -> 700219 Removing and installing front cover (engine compartment) - section on "Removing" Service and Repair.

Information

Component overview





Overview of oxygen sensors









Overview of exhaust manifold and catalytic converter






Removing oxygen sensor behind catalytic converter

CAUTION

Material damage can be caused by interchanged oxygen sensors.

- Change in emissions.
- Check Engine light comes on.

-> Do not confuse oxygen sensors.
-> Check correct assignment of oxygen sensors using the PIWIS Tester.

CAUTION

The oxygen sensor cable can be damaged if twisted.

- Change in emissions.
- Check Engine light comes on.

-> Always expose oxygen sensor cable so that the wire can turn when unscrewing or screwing in the sensor.
-> Do not kink cable.

1. Disconnect cable plugs on the oxygen sensors behind the catalytic converter and expose cables. To do this, trace cable routing to the oxygen sensors behind the catalytic converter and disconnect the corresponding cable plugs. => Cable plugs for oxygen sensors





Cable plugs for oxygen sensors

2. Remove oxygen sensors behind the catalytic converter. -2- => Detaching oxygen sensor using open-ended wrench (oxygen sensor behind catalytic converter for cylinders 1 to 3 shown) Unscrew both oxygen sensors behind the catalytic converter using a ring or open-ended wrench (a/f 22) or using open-end/ring wrench Nr.96-3 or open-end/ring wrench Nr.98.





Installation position of oxygen sensors





Detaching oxygen sensor using open-ended wrench (oxygen sensor behind catalytic converter for cylinders 1 to 3 shown)

Installing oxygen sensor behind catalytic converter

CAUTION

Material damage can be caused by interchanged oxygen sensors.

- Change in emissions.
- Check Engine light comes on.

-> Do not confuse oxygen sensors.
-> Check correct assignment of oxygen sensors using the PIWIS Tester.

CAUTION

The oxygen sensor cable can be damaged if twisted.

- Change in emissions.
- Check Engine light comes on.

-> Always expose oxygen sensor cable so that the wire can turn when unscrewing or screwing in the sensor.
-> Do not kink cable.

1. Install oxygen sensors. To do this, grease thread of oxygen sensors with Optimoly Paste MF (000 043 207 07) before fitting them. Make sure that the paste does not get into the slits in the sensor body. Screw in both oxygen sensors behind catalytic converter -2- using a ring or open-ended wrench (a/f 22) or using open-end/ring wrench Nr.96-3 or open-end/ring wrench Nr.98. => Tightening torque: 50 Nm (37 ftlb.)





Installation position of oxygen sensors





Removing and installing oxygen sensors

CAUTION

The oxygen sensor cable can be damaged if twisted.

- Change in emissions.
- Check Engine light comes on.

-> Always expose oxygen sensor cable so that the wire can turn when unscrewing or screwing in the sensor.
-> Do not kink cable.

2. Connect oxygen sensors. Route cable for the oxygen sensors, clip it in and connect cable plugs for the oxygen sensors behind catalytic converter. => Cable plugs on oxygen sensors





Cable plugs on oxygen sensors

Subsequent work

1. Fit engine compartment cover. -> 700219 Removing and installing front cover (engine compartment) Service and Repair.
2. Secure the bonnet.