audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensor 2 Before Catalytic Converter, Checking|Page 2565 > < Heated Oxygen Sensor 2 Before Catalytic Converter, Checking|Page 2563
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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). Refer to appropriate repair information.

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. Refer to appropriate repair information.

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 appropriate repair information.

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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. 

Heated Oxygen Sensor 2 Before Catalytic Converter, Checking|Page 2565 > < Heated Oxygen Sensor 2 Before Catalytic Converter, Checking|Page 2563