audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensor and Sensor Regulation before Catalytic Converter, Checking|Page 7621 > < Heated Oxygen Sensor and Sensor Regulation before Catalytic Converter, Checking|Page 7619
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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 obtained:

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Replace the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131). 

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 Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Removing and Installing ] See: Engine
Control Module/Service and Repair/Engine Control Module.

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Using a Multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector
terminals to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T94a terminals for an open circuit.

Heated Oxygen Sensor and Sensor Regulation before Catalytic Converter, Checking|Page 7621 > < Heated Oxygen Sensor and Sensor Regulation before Catalytic Converter, Checking|Page 7619