246919 Removing And Installing Oxygen Sensor Upstream Of Catalytic Converter - Turbo Engine
WM 246919 Removing and installing oxygen sensor upstream of catalytic converter - turbo engine
Tools
Technical values
Preliminary work
1. Remove rear apron.
-> 635519 Removing and installing rear apron .
2. Remove charge-air cooler.
-> 214319 Removing and installing charge-air cooler.
3. Remove heat shield on catalytic converter.
-> 635019 Removing and installing rear bumper 635019 Removing and installing rear bumper.
WARNING
Objects or loads falling down
- Risk of squashing or crushing
-> Secure components to prevent them from falling down.
Information
- It may only be supported over a large area at the oil pan.
- Localised loading is not permitted.
Information
- When lowering, the engine must not rest on the rear axle cross member.
4. Lower the engine.
4.1. Support the engine at the oil pan with a transmission jack.
Transmission and unit jack Junior Jack 2.0 WE 1223 ; GA passenger car transmission plate WE 1224
4.2. Loosen and screw off two M12 collar nuts (T55) on the engine mounting at the left and right.
4.3. Slowly lower the engine using the transmission jack.
Removing oxygen sensor upstream of catalytic converter
Information
Specifications for wrench sizes (a/f specifications) for screw heads are described as follows:
- Torx screws: (E.) for external Torx, (T.) for internal Torx.
- Hexagon-head bolts (internal and external hexagon): Wrench size (a/f)
Information
- Always expose oxygen sensor wire far enough for it to be able to turn when unscrewing the sensor.
1. Observe instructions when working with oxygen sensors.
-> 2400AW Precautionary measures when handling oxygen sensors.
2. Pull plug connection for oxygen sensor upstream of catalytic converter (blue cable) -1- in the engine compartment out of the bracket.
2.1. Release and pull off cable plug.
2.2. Plug connection on cylinder bank 1-3:
Oxygen sensor connectors, cylinder bank 1-3
2.3. Plug connection on cylinder bank 4-6:
Oxygen sensor connectors, cylinder bank 4-6
3. Guide the oxygen sensor cable at the side of the engine to the catalytic converter and unclip the cable from the left holder -arrow-.
4. Loosen and unscrew oxygen sensor upstream of catalytic converter (a/f 22) -1-.
Oxygen sensors at catalytic converter
Installing oxygen sensor upstream of catalytic converter
Information
- When reinstalling oxygen sensors, grease the thread with the Optimol Paste MF lubricant (Part No. 000.043.207.07) only.
- New oxygen sensors have already been greased and the thread is fitted with a protection cap.
1. Fit and tighten oxygen sensor upstream of catalytic converter (a/f 22) -1- at the catalytic converter.
=> Tightening torque: 50 Nm (37 ftlb.)+/-8 Nm (+/-6 ftlb.)
2. Guide the oxygen sensor cable at the side of the engine to the plug connection in the engine compartment and clip the cable into the holder -left arrow-.
Oxygen sensors
3. Connect the cable plug for the oxygen sensor upstream of the catalytic converter -1- in the engine compartment and clip the plug connection into the bracket.
3.1. Plug connection on cylinder bank 1-3:
Oxygen sensor connectors, cylinder bank 1-3
3.2. Plug connection on cylinder bank 4-6:
Oxygen sensor connectors, cylinder bank 4-6
Subsequent work
WARNING
Objects or loads falling down
- Risk of squashing or crushing
-> Secure components to prevent them from falling down.
Information
- It may only be supported over a large area at the oil pan.
- Localised loading is not permitted.
1. Raise and secure the engine.
1.1. Raise the engine using the transmission jack and move it into installation position.
1.2. Fit and tighten two M12 collar nuts (T55) on the engine mountings.
=> Tightening torque: 85 Nm (63 ftlb.)
2. Install heat shield on catalytic converter.
-> 635019 Removing and installing rear bumper 635019 Removing and installing rear bumper.
3. Install charge-air cooler.
-> 214319 Removing and installing charge-air cooler.
4. Install rear apron.
-> 635519 Removing and installing rear apron .