volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Heated Oxygen Sensor (HO2S) G39 and Oxygen Sensor Control Before Catalytic Converter, Checking|Page 6359 > < Heated Oxygen Sensor (HO2S) G39 and Oxygen Sensor Control Before Catalytic Converter, Checking|Page 6357
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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 Adapter Cable (121-pin) (VAG1598/31)24 Removal and Installation.

If the manufacturers test box is not being used. Perform the following step.

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Remove the Motronic Engine Control Module (ECM) (J220). Refer to --> [ Engine Control Module, Replacing ] .

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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) (J220) electrical harness connector T121 terminals for resistance. 

Heated Oxygen Sensor (HO2S) G39 and Oxygen Sensor Control Before Catalytic Converter, Checking|Page 6359 > < Heated Oxygen Sensor (HO2S) G39 and Oxygen Sensor Control Before Catalytic Converter, Checking|Page 6357