RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
Checking primary voltage
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Switch the ignition on.
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Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector
terminals 3 to 4 for voltage.
Specified value: 0.400 to 0.500 Volts
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Switch the ignition off.
If the specified value was obtained:
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Replace the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131). Refer to Fuel Injection and Ignition Repair
Information.
If the specified value was not obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box. Refer to Fuel Injection and Ignition Repair Information.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Engine Control Module (ECM) 2 (J624 ). Refer to => [ Engine Control Module 1, Removing and Installing ] See: Engine Control
Module/Service and Repair/Engine Control Module 1, Removing and Installing.