Exhaust System Components, Removing And Installing: Notes
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, see THREE WAY CATALYTIC CONVERTER (TWC), CHECKING .
The following list pertains to Fig 1.
- Tunnel bridge
- Suspended mount
- Note installed position, see Installation position of muffler suspension
- 25 Nm
- Front exhaust pipe with catalytic converter
- Check catalytic converter, see THREE WAY CATALYTIC CONVERTER (TWC), CHECKING
- 40 Nm
- replace
- Seal
- replace
- Turbocharger
- 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), see OXYGEN SENSOR HEATER FOR OXYGEN SENSOR BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING
- Check Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC), see OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING
- 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
- For Heated Oxygen Sensor (HO2S) - G39- and Oxygen Sensor (O2S) Heater -Z19-
- 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), see OXYGEN SENSOR HEATER FOR OXYGEN SENSORS BEHIND THREE WAY CATALYTIC CONVERTER (TWC), CHECKING
- Check Oxygen Sensor (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC), see OXYGEN SENSOR AND OXYGEN SENSOR CONTROL BEHIND THREE WAY CATALYTIC CONVERTER (TWC), CHECKING
- 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
- Double clamp
- Note installed position, see Installation position of double clamp
- 40 Nm
- Suspended mount
- 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 Separation point at exhaust pipe
- Install muffler free of tension, see Installing muffler free of tension
- Suspended mount