RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
Checking primary voltage
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness connector terminals 2 to 6 for voltage.
Specified value: 0.400 to 0.500 Volts
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Switch the ignition off.
If the specified value was not obtained:
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Replace the Heated Oxygen Sensor (HO2S) 2 (G108 ). Refer to Fuel Injection and Ignition Repair Information.
If the specified value was 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.
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Using a Multimeter, check the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness connector terminals to the Engine Control Module
(ECM) 2 (J624) electrical harness connector T94a terminals for an open circuit.