Passat L4-1.8L Turbo (AWM) (2004)
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The respective fuses of Heated Oxygen Sensor (HO2S) -G39- must be OK.
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Battery voltage must be at least 11.5 volts.
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All electrical consumers like, for example, lights and rear window heating must be switched off.
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Parking brake must be engaged or else daylight driving lights will be switched on.
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If vehicle is equipped with an A/C system, it must be switched off.
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Ground (GND) connections between engine and chassis must be OK.
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Exhaust system must be properly sealed between catalytic converter and cylinder head.
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Coolant temperature must be at least 80 degrees C, Diagnostic mode 1: Check measuring values; PID 5, Coolant temperature. Refer to "Scan
Tool Testing/Diagnostic Mode 1: Check Measuring Values".
See: Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 1: Check Measuring Values
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Oxygen sensor heaters for oxygen sensors before catalytic converter must be OK,
See: Testing and Inspection/Component Tests and General Diagnostics/Oxygen Sensor Heater For Oxygen Sensors Before Three Way Catalytic
Converter (TWC), Checking
Function test
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Select the following output of oxygen sensor signals and check whether the specified values are being reached, Diagnostic mode 5: Check output
of oxygen sensor signals. Refer to "Scan Tool Testing/Diagnostic Mode 5: Check Output of Oxygen Sensor Signals".
See: Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 5: Check Output of Oxygen Sensor Signals
If specified values are obtained:
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End diagnosis and switch ignition off.
If specified values are not obtained:
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End diagnosis and let engine continue to run at idle.
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Check primary voltage.
Checking primary voltage
Vehicles with engine code AEB
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Disconnect 4-pin harness connector (brown) to Heated Oxygen Sensor (HO2S) -G39- (-1-).