volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Heated Oxygen Sensor G39, Checking|Page 775 > < Heated Oxygen Sensor G39, Checking|Page 773
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Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor 2 G108, Checking

Heated Oxygen Sensor 2 G108, Checking

NOTE:  When servicing terminals in the electrical harness connector of Heated Oxygen Sensor (HO2S) 2 G108, use only gold-plated terminals.

Special tools, testers and auxiliary items required

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Multimeter.

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Wiring diagram.

Test requirements

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FuseSB11 OK.

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Battery voltage at least 12.5 volts.

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All electrical consumers such as, lights and rear window defroster, switched off.

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Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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A/C switched off.

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Ground (GND) connections between engine/transmission/chassis OK.

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Ignition switched off.

Test procedure

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Perform a preliminary check to verify the customers complaint.  See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Preliminary Check

Start diagnosis

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Perform the function test in Diagnostic Mode 06.  See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan
Tool Testing and Procedures/Diagnostic Mode 06 - Read Test Results For Specific Diagnostic Functions

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End diagnosis and switch ignition off.

If the specified values are not obtained:

Checking primary voltage

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Remove the air filter.

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Disconnect the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector - 2

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Using a multimeter, check the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector - 2 - terminals 1 to 5 for voltage.

Specified value: 0.400 to 0.500 Volts

Heated Oxygen Sensor G39, Checking|Page 775 > < Heated Oxygen Sensor G39, Checking|Page 773