A8L Quattro Sedan V8-4.2L (BVJ) (2007)
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Crank the engine.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) 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 Heated Oxygen Sensor (HO2S) (G39).
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.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Removing and Installing ] See: Powertrain
Management/Computers and Control Systems/Engine Control Module/Service and Repair.
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Using a Multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminals to the Motronic Engine Control
Module (ECM) (J623) electrical harness connector T94 terminals for an open circuit.