Q7 Quattro V8-4.2L (BAR) (2008)
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Disconnect the black Heated Oxygen Sensor (HO2S) (G39) electrical harness connector - 1 - or the Heated Oxygen Sensor (HO2S) 2 (G108) - 3 -.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) electrical harness connector - 1 - terminals 1 to 5 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) (G39) or the Heated Oxygen Sensor (HO2S) 2 (G108).
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, Replacing ] See: Engine Control
Module/Service and Repair/Engine Control Module, Replacing.
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Using a Multimeter, check the Heated Oxygen Sensor (HO2S) (G39) or the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness connector
terminals to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T94 terminals for an open circuit.