Jetta SportWagen L4-2.0L Turbo (CCTA) (2009)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Regulation Before Catalytic Converter, Checking
Diagnostic Procedures
Oxygen Sensor Regulation Before Catalytic Converter, Checking
‹› 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
‹› multimeter.
‹› Wiring diagram.
Test requirements
‹› The Heated Oxygen Sensor (HO2S) (G39) fuse OK.
‹› The Oxygen Sensor (O2S) Heater (G39) before catalytic converter OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Exhaust system between catalytic converter and cylinder head properly sealed.
‹› Coolant Temperature at least 80 °C.
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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Connect scan tool.
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Start the engine and let it run at idle.
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Select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
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Select "Test-ID 01: Oxygen sensor monitoring before catalytic converter".