Passat Syncro Wagon V6-2.8L (ATQ) (2000)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor & O2S Control Behind Three Way Catalytic Converter (TWC), Checking
With Generic Scan Tool
Oxygen Sensor and oxygen sensor control behind Three Way Catalytic Converter (TWC), checking
NOTE: When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S), 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 set
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Wiring diagram
Test requirements
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The respective fuses of Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- and Oxygen Sensor (O2S) 2 Behind Three
Way Catalytic Converter (TWC) -G131- 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 heater for oxygen sensors behind 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. 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
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Check the specified values of the output of oxygen sensor signals at idle:
*) V = Voltage in Volts (oxygen sensor signal)
**) t = Time in seconds