GTI V6-2.8L (BDF) (2002)
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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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For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
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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.
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan
Tool/Diagnostic Mode 1: Check Measured Values
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Oxygen sensor heater for oxygen sensor before catalytic converter must be OK.
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Oxygen Sensor Heater
For O2 Sensor Before TWC, Checking
Function test
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Select the output of oxygen sensor signals and check whether the specified values are being reached, Diagnostic mode 5: Check output of oxygen
sensor signals.
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan
Tool/Diagnostic Mode 5: Check Output of Oxygen Sensor Signals
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End diagnosis and switch ignition off.
If specified values are not obtained:
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Test oxygen sensor wires.
Checking oxygen sensor wires
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Connect test box to control module wiring harness, connect test box for wiring test.
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool
Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring Test
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Unscrew protective cover (arrows) and disconnect 6-pin harness connector (black) -1- to Heated Oxygen Sensor (HO2S) -G39- before catalytic
converter.