Heated Oxygen Sensor After Catalytic Converter, Bank 2

Heated Oxygen Sensor after Catalytic Converter, Bank 2





Special tools, testers and auxiliary items required

• Hose Clamps Up to 25 mm dia. (3094)

• Ring Spanner 7-piece Set (3337)

• Engine/Transmission Jack (V.A.G 1383 A)

Removing

• All cable ties unfastened or cut open on removal are to be re-attached in same position on installation.

- Remove rear engine cover - arrows -.





- Remove cover - 1 - on left side of engine compartment.





- Pinch off coolant hose - 2 - with Hose Clamps Up to 25 mm dia. (3094) and detach at coolant expansion tank.





- Remove coolant expansion tank bolt - arrow -.

- Disconnect Engine Coolant Level (ECL) Warning Switch (F66) wiring at bottom of expansion tank and lay aside coolant expansion tank with coolant hose - 1 - connected.

- Use suitable plug to seal connection, if necessary.

- Take connectors - 1 - to - 4 - out of holder on right side of bulkhead.





- Disconnect connector - 1 -.

- Remove holder at bulkhead.

- Remove heat insulation sleeve at wiring harness.

- Lay free Heated Oxygen Sensor (HO2S) wiring downward.

- Remove left front wheel.

- Screw out bolts - arrows - for exhaust pipe of auxiliary/additional heater at noise insulation, on vehicles with auxiliary heater.





- Unfasten quick-release fasteners - 1 -, remove bolts - 2 - and detach noise insulation.





- Remove holder screws for noise insulation - arrows -.





- Detach universal mount (V.A.G 1359/2) from Engine/Transmission Jack (V.A.G 1383 A) and place wooden block - arrow - on press tool instead.





- Support rear cross member using Engine/Transmission Jack (V.A.G 1383 A).

- Remove bolts - 1 - and - 2 -, then bolts - 3 - and - 4 -.

- Slowly lower rear cross member, using Engine/Transmission Jack (V.A.G 1383 A), until distance between rear cross member and body is equal to dimension "x".





• Dimension x = 60 mm

• Transmission must not be lowered any further as joint of drive shaft and decoupling elements of exhaust system could be damaged.

- Remove heat shield for right drive axle - arrow -.





- Remove connecting rod - 2 -.





- Remove socket-head bolt - 1 -.

- Lay free Heated Oxygen Sensor (HO2S) wires - arrows - at locations marked on transmission.





• Illustration shows engine/transmission assembly removed.

- Remove Heated Oxygen Sensor (HO2S) - 2 - using special tool (3337).





Installing

Install in reverse order, paying attention to the following:

• Thread of new Heated Oxygen Sensor (HO2S) is coated with assembly paste which must not be allowed to go into openings in probe.

• Re-attach all cable ties at same location on installation.

- Install subframe.

- Perform stress-free alignment of exhaust system.

Tightening Specifications





* If a Heated Oxygen Sensor (HO2S) is to be re-used, grease thread only with hot bolt paste. This must not be allowed to go into openings in probe.