Passat Syncro Wagon V6-2.8L (ATQ) (2000)
If oxygen sensor control in display fields 1 or 3 does not oscillate in specified range:
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Press -> button.
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Press buttons -0- and -6- to select "End data transfer" function 06. Press -Q- button to confirm input.
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Free Heated Oxygen Sensor (HO2S) with a road test and repeat test.
Observe safety precautions which apply to road tests.
If expected values are not obtained even after a road test, that is if oxygen sensor control does not oscillate by at least 2%:
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Switch ignition off.
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Replace appropriate Heated Oxygen Sensor (HO2S).
Checking Primary Voltage
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Unplug 4-pin harness connector going to corresponding Heated Oxygen Sensor (HO2S):