247319 Removing and installing oxygen sensors (LS) behind catalytic converter

WM 247319 Removing and installing oxygen sensors (LS) behind catalytic converter

Tools

Technical values

Preliminary work

1. Remove air cleaner housing.
-> 242519 Removing and installing air cleaner housing.
2. Open oxygen sensor connectors in engine compartment.
The sensor connectors and cables are of different colors.

2.1. Open connector on left; to do so pull the two connectors out of the holder and then release them.
Unclip cable -arrow-.

Oxygen sensor plug connections on side 1-3

2.2. Open connector on right; to do so pull the two connectors out of the holder and then release them.
Unclip cable -arrows-.

Oxygen sensor plug connections on side 4-6

3. Remove rear wheel. Use special tool Socket-wrench insert P300.
-> 44051900 Removing and installing wheel.

WARNING

Objects or loads falling down

- Risk of squashing or crushing

-> Secure components to prevent them from falling down.

4. Support engine with transmission and unit jack Junior Jack 2.0 WE 1223 and GA passenger car transmission plate WE 1224 at the oil pan.
4.1. When positioning pay attention to the oil level sensor.
5. Unscrew two M12 special nuts (inner Torx, screw insert T55) -1- at the engine mounting (hydraulic mount) on the left and right.

Engine carrier at engine mounting on side 4-6 (view from below)

Information

- When lowering, the engine must not rest on the rear axle cross member.

6. Carefully lower engine using the transmission jack.

Removal

Removing oxygen sensor

CAUTION

Hot components

- Risk of burns

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

1. Observe instructions when working with oxygen sensors.
-> 2400AW Precautionary measures when handling oxygen sensors.

Installation position of oxygen sensors on side 1-3

Oxygen sensors on side 1-3

Oxygen sensors on side 4-6

2. Unclip cable for oxygen sensor behind catalytic converter (black) at the mounting points (item 5).

Tool recommendation:

Tool overview

3. Loosen oxygen sensor.

Using tool for oxygen sensor (shown with engine removed)

3.1. Connect extension with crow foot wrench -2- and connect to hexagon on sensor -1-. Position torque wrench and loosen sensor.

Using tool in vehicle

3.2. Unscrew oxygen sensor by hand.

Installation

Installing oxygen sensor

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. Observe instructions when working with oxygen sensors.
-> 2400AW Precautionary measures when handling oxygen sensors.
2. During reinstallation of the oxygen sensor, the thread must be coated with the prescribed lubricant.
3. Screw in oxygen sensor by hand and tighten to tightening specification.
=> Tightening torque: 50 Nm (37 ftlb.)+/-8 Nm (+/-6 ftlb.)
4. Route oxygen sensor cable (black) along the engine and secure it at the defined mounting points (see overview diagrams, item 5).

Subsequent work

WARNING

Objects or loads falling down

- Risk of squashing or crushing

-> Secure components to prevent them from falling down.

1. Raise engine into installation position with transmission jack.
2. Position M12 special nut (inner Torx, screw insert T55) -1- and tighten it to the tightening specification.

Engine carrier to engine mounting (view of cylinder bank 4-6)

=> Tightening torque: 85 Nm (63 ftlb.)
3. Route oxygen sensor cable in engine compartment and secure in the retaining clips.
3.1. Close plug connections and insert into the holders.
4. Install air cleaner housing.
-> 242519 Removing and installing air cleaner housing.
5. Mount rear wheel.
-> 44051900 Removing and installing wheel.