Passat Syncro Wagon V6-2.8L (ATQ) (2000)
If oxygen sensor heater is not active, that is if it stays at 0:
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Test oxygen sensor heater after catalytic converter. See: Oxygen Sensor Heater For O2 Sensors Behind (TWC), Checking/With Manufacturer's
Scan Tool
If Heated Oxygen Sensor (O2S) or oxygen sensor control after Three Way Catalytic Converter (TWC) is not active:
Checking Primary Voltage
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Keep engine running.
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Unplug 4-pin harness connector going to corresponding Heated Oxygen Sensor (HO2S):
Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-, bank 1 4-pin harness connector (green) (arrow).