audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensor and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 7176 > < Heated Oxygen Sensor and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 7174
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Checking primary voltage

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Crank the engine.

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Using a multimeter, check the Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) (G287) electrical harness connector
terminals 3 to 4 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 Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) (G287). 

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) 2 (J624). Refer to => [ Engine Control Module, Removing and Installing ] See: Engine Control
Module/Service and Repair/Engine Control Module, Removing and Installing.

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Using a Multimeter, check the Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) (G287) electrical harness connector

Heated Oxygen Sensor and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 7176 > < Heated Oxygen Sensor and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 7174