Catalytic Converter: Service and Repair

Exhaust Manifold, Front Exhaust Pipe with Catalytic Converter and Attachments Assembly Overview






1 Warm air collector plate

2 Heated oxygen sensor (G39) , 50 Nm

• Use ring spanner set for oxygen sensor (3337) for removal and installation

• Threads of new oxygen sensors are coated with assembly paste

• when using an oxygen sensor once again, only use hot bolt paste (G 052 112 A3) to grease the thread; do not let paste get onto slits of oxygen sensor body

• If sealing ring is leaking cut open and replace.

• Component location of harness connector: in the engine compartment on the bulkhead. Refer to => [ (Item 14) electrical connector ] Component Locations Overview

3 23 Nm

4 10 Nm

5 23 Nm

• Replace

6 Exhaust Manifold

• Coat stud bolts with hot bolt paste (G 052 118 A3).

7 Gasket

• Replace

8 Gasket

• Replace

9 23 Nm

• Replace

10 Front exhaust pipe

• with catalytic converter

• Protect from shocks and impact stress

• with decoupling element

• Do not bend the decoupling element more than 10° - otherwise it may get damaged

• Install exhaust system free of stress => [ Exhaust System, Installing ] Service and Repair

• Component location of harness connector: in the engine compartment on the bulkhead. Refer to => [ (Item 14) electrical connector ] Component Locations Overview

11 Oxygen sensor behind three way catalytic converter (G130) , 55 Nm

• Use ring spanner set for oxygen sensor (3337) for removal and installation

• Threads of new oxygen sensors are coated with assembly paste

• when using an oxygen sensor once again, only use hot bolt paste (G 052 112 A3) to grease the thread; do not let paste get onto slits of oxygen sensor body

• If sealing ring is leaking cut open and replace.

12 Spring nut

• Insert from front

13 Front clamping sleeve

• Before tightening, ensure exhaust system is tension-free => [ Exhaust System, Installing ] Service and Repair

• Installed location => [ Installed position of front clamping sleeve ]

• Tighten bolts evenly

14 23 Nm

15 Heat shield

• For catalytic converter

16 5 Nm

17 10 Nm

18 23 Nm

19 Suspended mount

• Replace if damaged

Connector for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130)





Harness connector is located at right on vehicle floor under cover.

1. Bracket

2. Harness connector for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) , brown


The oxygen sensor after three-way catalytic converter (G130) cable is held in place with a clip - arrow -.

Installed position of front clamping sleeve





- Arrow - points in direction of travel.

- Line up the front clamping sleeve - 1 - with the marking on the catalytic converter - 2 -.

- a -= 5 mm

• Mounting bolts must be on right side. They must not project beyond the lower edge of the clamp.