Exhaust System: Locations

Exhaust System Components, Removing And Installing

NOTE:
- After exhaust system repairs, make sure exhaust system is not under stress and that it has sufficient clearance from the bodywork. If necessary, loosen double clamps and clamp and align exhaust pipe so that sufficient clearance is maintained to the bodywork and support rings carry uniform loads.
- Do not use any silicone sealant. Traces of silicone components which are sucked into the engine are not burned there, and they damage the oxygen sensor.
- Always replace self-locking nuts.
- Components marked with * are checked via On Board Diagnostic (OBD).

- Check catalytic converter.







1 Tunnel bridge
2 Suspended mount
- Note installed position, See Fig. 4
3 25 Nm
4 Front exhaust pipe with catalytic converter
- Check catalytic converter
5 40 Nm
6 Seal
7 Turbocharger
8 Heated Oxygen Sensor (HO2S) -G39- bank 1*, 50 Nm
- Only use "G 052 112 A3" to grease thread; do not let "G 052 112 A3" get onto slit of oxygen sensor
- remove and install using ring spanner 7- piece set (3337) for oxygen sensor
- If seal is leaking, cut open seal and replace seal
- Check oxygen sensor heater for Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC)
- Check Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC)
9 Connector
- For Heated Oxygen Sensor (HO2S) -G39- and Oxygen Sensor (O2S) Heater -Z19

Vehicles with engine code AWD:
- Black, 4-pin

Vehicles with engine code AWP, AWW:
- Black, 6-pin
- Terminals are gold-plated

10 Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- bank 1*, 50 Nm
- Only use "G 052 112 A3" to grease thread; do not let "G 052 112 A3" get onto slit of oxygen sensor
- remove and install using ring spanner 7- piece set (3337) for oxygen sensor
- If seal is leaking, cut open seal and replace seal
- Check oxygen sensor heater for Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC)
- Check Oxygen Sensor (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC)
11 Connector
- For Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- and Oxygen Sensor (O2S) Heater 1 -Z29-
- Black, 4-pin
- Terminals 3 and 4 gold-plated
12 Double clamp
- Note installed position, See Fig. 3
13 40 Nm
14 Suspended mount
15 Center and rear muffler
- At factory, center and rear mufflers are installed as a single component.
Replacement center and rear mufflers are supplied separately, with double clamp for connecting joint.
- Separating point: See Fig. 1
- Install muffler free of tension, See Fig. 2
16 Suspended mount

Fig. 1 Separation point at exhaust pipe







- Separate exhaust pipe at right angle to separation point (arrow 2).
- Position replacement double clamp -4- between arrows 1 and 3 when installing.
Tightening torque 40 Nm

Fig. 2 Installing muffler free of tension







- Mounting bolt at exhaust pipe must be parallel to tunnel bridge (dimension -x- same at left and right).

Fig. 3 Installation position of double clamp







- Position double clamp with approx. 5 mm gap to marking A (arrow 1).

NOTE: Marking -A- is valid for vehicles with manual and automatic transmission.

Fig. 4 Installation position of muffler suspension







- Angled side at foot of suspension (arrow) faces front of vehicle.