Jetta Sedan L5-2.5L (CBTA) (2009)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor O2S 1 Before Catalytic Converter Heater, Checking
Oxygen Sensor O2S 1 before Catalytic Converter Heater, 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 box 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 with air filter.
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: 2.5 to 19.0 ohms (at approx. 20 °C)