Passat V6-2.8L (ATQ) (2004)
Oxygen Sensors and Oxygen Sensor Regulation Before Catalytic Converter, Checking
Oxygen Sensors And Oxygen Sensor Regulation Before Catalytic Converter, Checking
NOTE: When servicing terminals in harness connector of oxygen sensor, use only gold-plated terminals.
Recommended special tools and equipment
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V.A.G 1526 multimeter or V.A.G 1715 multimeter
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V.A.G 1594 connector test kit
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Wiring diagram
Test requirements
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The respective fuses of Heated Oxygen Sensor (HO2S) -G39- and Heated Oxygen Sensor (HO2S) 2 -G108- must be OK
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Battery voltage must be at least 11.5 volts.
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All electrical consumers such as, lights and rear window defroster 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 measured values; PID 5, Coolant temperature. See: Computers and
Control Systems/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, check.
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. See: 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
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
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Disconnect 4-pin harness connector to the respective oxygen sensor: