9-3 Viggen Coupe (9400) L4-2.3L Turbo (B235) HO (1999)
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Exhaust Pipe: Service and Repair
Front Exhaust Pipe With Catalytic Converter (B235R)
Front Exhaust Pipe With Catalytic Converter (B235R) Adjustment/Replacement
Dismantling
When changing the front exhaust pipe, first remove the oxygen sensor (the rear one also in the case of OBDII) for fitting on the new exhaust pipe.
Before fitting the oxygen sensor, apply Molycote 1000, Part no. 30 20 971 to its threads.
Important: The leads of the oxygen sensors must not be twisted. Twisted leads are susceptible to vibration and the leads could fracture.
Since the oxygen sensors are sensitive to impacts and shocks, they must be handled with care.
Tightening torque: 55 Nm (41 ft. lbs.)
1. Remove the bypass pipe with valve. Collect the O-ring where the pipe is connects to the turbo's intake pipe.
2. Remove the exhaust manifold's heat shield.
3. Unplug the oxygen sensor's connector.
In the case of OBDII, also unplug the rear oxygen sensor's connector. Snip the cable tie securing the sensor's lead. Thread the lead through so that
it runs freely.