2001 Volvo S40 Catalytic Converter Service and Repair Guide
Install:
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the gasket on the turbocharger (TC)
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the three-way catalytic converter (TWC). The nuts.
Tighten to 30 Nm.
Installing the front (upper) heated oxygen sensor (HO2S)
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Install a new sealing ring
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Apply copper paste (P/N 1161035-9) to the entire length of the screw thread
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To avoid damage from twisting to the cable harness for the heated oxygen sensor (HO2S), turn the probe approximately 4 turns counter-clockwise
before inserting it
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Install the heated oxygen sensor (HO2S). Tighten to 55 Nm
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Install the heat shield on the body. Raise the car.
Installing the rear (lower) heated oxygen sensor (HO2S)
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Install a new sealing ring
-
Apply copper paste (P/N 1161035-9) to the entire length of the screw thread
-
To avoid damage from twisting to the cable harness for the heated oxygen sensor (HO2S), turn the probe approximately 4 turns counter-clockwise
before inserting
-
Install the heated oxygen sensor (HO2S). Tighten to 55 Nm.
Installing the front exhaust pipe on the three-way catalytic converter (TWC)