Jetta Sedan L5-2.5L (BGP) (2005)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor Heater Circuit, Checking
Heated Oxygen Sensor Heater Circuit, Checking
‹› When servicing terminals in the electrical 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
‹› Fuse (SB45) 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 --> [ Engine Control Module, Replacing ] .
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 - 1 -.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) terminals 3 to 4 for resistance.