Touareg 2 V6-3.6L (BHK) (2008)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor 2, Checking
Heated Oxygen Sensor 2, Checking
The following procedure is used to diagnose the Heated Oxygen Sensor (HO2S) 2 (G108)
‹› Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Heated Oxygen Sensor (HO2S) 2 (G108).
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Oxygen Sensor (O2S) 2 Heater (Z28) fuses OK.
‹› The Oxygen Sensor (O2S) 2 Heater (Z28) before catalytic converter OK. Refer to--> [ Oxygen Sensor O2S 2 Heater, Checking ] See: Computers
and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Oxygen Sensor O2S 2 Heater, Checking.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Exhaust system between catalytic converter and cylinder head properly sealed.
‹› Coolant Temperature at least 80° C.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to --> [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
Function test
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Connect scan tool.