A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
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Start the engine.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector 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 obtained:
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Replace the Heated Oxygen Sensor (HO2S) (G39). 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) (J623). Refer to => [ Engine Control Module, Replacing ] See: 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 Engine Control Module (ECM)
(J623) electrical harness connector T94 terminals for resistance.