GTI L4-2.0L Turbo (BPY) (2007)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor (O2S) Heater Z19 For Heated Oxygen Sensor (HO2S) G39 Before Catalytic
Converter, Checking
Oxygen Sensor (O2S) Heater Z19 For Heated Oxygen Sensor (HO2S) G39 Before Catalytic Converter, Checking
NOTE: When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S) G39, use only gold-plated terminals.
Special tools, testers and auxiliary items required
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Multimeter.
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Wiring diagram.
Test requirements
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The Heated Oxygen Sensor (HO2S) G39 fuse OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off. Vehicles with automatic transmission, shift selector lever into
position "P" or "N".
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Ignition switched off.
Procedure
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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+4 for an open circuit.
Specified value: 2.5 to 10.0 Ohms (at approx. 20 degree C)
If the specification was not obtained:
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Replace the Heated Oxygen Sensor (HO2S) G39.
If the specification is obtained:
Checking voltage supply
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal 4 to the Engine Component Power Supply