audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking|Page 3382 > < Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking
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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 Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Replacing ] See: Powertrain Management/Computers
and Control Systems/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 Engine Control Module (ECM) (J623) electrical harness connector T94 terminals for an open circuit.

Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking|Page 3382 > < Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking