Passat L4-1.8L Turbo (AWM) (2004)
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Disconnect 4-pin harness connector (black) to Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130- (-1-).
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Use adapter cables from (VAG1594) to connect multimeter to terminals 3 + 4 (Motronic ECM connector) for voltage measurement.
Vehicles with engine code ATW
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Disconnect 4-pin harness connector (brown) to Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130- (-1-).