audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 537 > < Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking
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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). 

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.

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 => [ replacing ] See: Powertrain Management/Computers and Control
Systems/Engine Control Module/Testing and Inspection/Engine Control Module (ECM) (J623).

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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.

Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 537 > < Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking