Tiguan 4Motion (5N1) L4-2.0L Turbo (CCTA) (2009)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Heater Before Catalytic Converter, Checking
Diagnostic Procedures
Oxygen Sensor Heater Before Catalytic Converter, Checking
‹› When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S) (G39), use only gold-plated terminals.
Special tools, testers and auxiliary items required
‹› multimeter.
‹› Wiring diagram.
Test requirements
‹› The Heated Oxygen Sensor (HO2S) (G39) fuse 21 in Fuse Panel B is 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: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check
Start diagnosis
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Remove the engine cover.
Checking internal resistance
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Disconnect the Heated Oxygen Sensor (HO2S) (G39 ) electrical harness connector.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) terminals 3 and 4 for correct resistance.
Specified value: 2.0 to 10.0 ohms (at approx. 20 °C)
If the specified value was Not obtained:
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Replace the Heated Oxygen Sensor (HO2S) (G39).
If the specified value was obtained:
Checking voltage supply
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Turn the ignition switch ON
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminal 4 to engine ground for voltage.
Specified value: Battery voltage.
If the specified value was Not obtained:
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Check the wiring for an open, high resistance or short to Ground (GND) between terminal 4 of the Heated Oxygen Sensor (HO2S) (G39)and fuse