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Front exhaust system with three-way catalytic converter, V6

Front exhaust system with three-way catalytic converter, V6

To remove

Important

The oxygen sensor cable must not be of twisted type. Twisted cables exposed to vibration can break.

The oxygen sensor is sensitive to impacts and jolting and must be handled with care.



1. Remove the front exhaust manifold's heat shield.

2. Unbolt the front pipe from the turbo.


3. Unplug the oxygen sensor's connector.

4. Raise the car.

5. Snip the cable tie securing the oxygen sensor cable. Note the way the cable is run and lower the cable.


6. Separate the pipe joint between the front and rear exhaust systems.

Note

Removal of the front exhaust system will be easier if a cable tie, part No. 83 95 212, is fastened round the front pipe.


7. Detach the front exhaust pipe from the rear exhaust manifold and lower away the front exhaust system.

8. Remove the oxygen sensor.


To fit

Important

The oxygen sensor cable must not be of twisted type. Twisted cables exposed to vibration can break.

The oxygen sensor is sensitive to impacts and jolting and must be handled with care.



1. Coat the oxygen sensor threads with Molycote 1000, part No. 30 20 971.

2. Fit the oxygen sensor.

Tightening torque: 55 Nm (40.6 lbf ft).

3. Fit the front exhaust pipe to the rear exhaust manifold.

Tightening torque: 40 Nm (29.5 lbf ft).

Note

Removal of the front exhaust system will be easier if a cable tie, part No. 83 95 212, is fastened round the front pipe.



4. Fit the pipe joint between the front and rear exhaust systems.

Tightening torque: 22 Nm (16.2 lbf ft).

5. Use a cable tie to secure the oxygen sensor cable. Carefully run the cable back to the oxygen sensor connector.

6. Lower the car to the floor.

7. Plug in the oxygen sensor connector.


8. Bolt the front exhaust pipe to the turbo.

Tightening torque: 24 Nm (17.7 lbf ft).

9. Fit the front exhaust manifold's heat shield.

Tightening torque: 24 Nm (17.7 lbf ft).

10. Start the engine and check for leakage.