246919 Removing and installing oxygen sensors ahead of catalytic converter on DFI engines

WM 246919 Removing and installing oxygen sensors ahead of catalytic converter on DFI engines

Tools









Technical values






Preliminary work

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

Information

Component overview





Overview of oxygen sensors and primary catalytic converters









Overview of exhaust manifold and catalytic converter






Removing oxygen sensors ahead of 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 ahead of the catalytic converter and expose cables. To do this, trace cable routing to the oxygen sensors ahead of the catalytic converter and disconnect the corresponding cable plugs. => Cable plugs for oxygen sensors





Cable plugs for oxygen sensors

2. Remove oxygen sensors ahead of catalytic converter. -1- => Detaching oxygen sensor using open-ended wrench (oxygen sensor behind catalytic converter for cylinders 1 to 3 shown) Unscrew both oxygen sensors ahead of 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 sensors ahead of 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.





Overview of oxygen sensors





1. Carefully coat the thread of the oxygen sensors -1- with 000.043.207.07 and screw in by hand.





Installation position of oxygen sensors





Removing and installing oxygen sensors





Special tools for oxygen sensors





Screw in both oxygen sensors ahead of 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.
=> Tightening torque: 50 Nm (37 ftlb.)
2. Route cables for oxygen sensors => Cable plugs on oxygen sensors. Connect oxygen sensors.





Cable plugs on oxygen sensors

Subsequent work

1. Install engine compartment trim panels.
-> 700219 Removing and installing front trim (engine compartment) Service and Repair.
2. Secure bonnet using original bonnet stay and close it.