GTI L4-2.0L Turbo (BPY) (2007)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor (HO2S) G39 and Oxygen Sensor Regulation Before Catalytic Converter,
Checking
Heated Oxygen Sensor (HO2S) G39 And Oxygen Sensor Regulation Before Catalytic Converter, Checking
NOTE: Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Heated Oxygen Sensor (HO2S) G39.
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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The Oxygen Sensor (O2S) Heater Z19 before catalytic converter OK. See: Oxygen Sensor (O2S) Heater Z19 For Heated Oxygen Sensor (HO2S)
G39 Before Catalytic Converter, Checking
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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.
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Exhaust system between catalytic converter and cylinder head properly sealed.
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Coolant Temperature at least 80 degrees C.
Function test
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Perform a function test.
If the specified values are not obtained:
Checking primary voltage
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Disconnect the black Heated Oxygen Sensor (HO2S) G39 electrical harness connector -1 -.