Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
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4-pin connector (green) for Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC) -G130- for bank 1 (arrow).
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4-pin connector (brown) for Oxygen Sensor (O2S) 2 behind three Way Catalytic Converter (TWC) -G131- for bank 2 (arrow).
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Connect multimeter US1119 (Fluke 83 or equivalent) between O2S connector terminals 1 and 2, using VW1594 connector test kit.
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Measure resistance.
Specified value: 0.0-19.9 Ohms
If resistance is NOT OK:
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Replace respective Oxygen Sensor (O2S).
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Cylinder bank 1 -G130-, item 26, See: Service and Repair
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Cylinder bank 2 -G131-, item 15, See: Service and Repair