Jetta Sedan L5-2.5L (CBTA) (2009)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor O2S 1 Before Catalytic Converter, Checking
Oxygen Sensor O2S 1 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 (Z19) before catalytic converter OK. Refer to--> [ Oxygen Sensor O2S 1 in center Three Way Catalytic
Converter Heater,
Checking ] See: Testing and Inspection/Component Tests and General Diagnostics/Oxygen Sensor O2S 1 in Center Three Way Catalytic Converter
Heater, Checking.
‹› 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".