Touareg 2 V6-3.6L (BHK) (2008)
Oxygen Sensor O2S 2 Heater, Checking
Oxygen Sensor O2S 2 Heater, Checking
The following procedure is used to diagnose Oxygen Sensor (O2S) Heater (Z19) for Heated Oxygen Sensor (HO2S) (G108)
‹› When servicing electrical harness connector terminals for the Heated Oxygen Sensors, use only gold-plated terminals.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Heated Oxygen Sensor (HO2S) (G108) fuse OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
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
Checking internal resistance
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Disconnect the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness connector- 4 -.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G108) terminals 3 to 4 for resistance.
Specified value: 2.5 to 10.0 ohms (at approx. 20° C)
If the specification was not obtained: