Passat L4-1.8L Turbo (AWM) (2004)
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Disconnect 4-pin harness connector (brown) to Heated Oxygen Sensor (HO2S) -G39- (-1-).
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Use adapter cables from (VAG1594) to connect multimeter to terminals 3 + 4 (ECM connector) for voltage measurement.
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Start engine and measure primary voltage.
Specified value: 0.40 to 0.50 Volts
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Switch ignition off.
Vehicles with engine code ATW
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Disconnect 4-pin harness connector (black) to Heated Oxygen Sensor (HO2S) -G39- (-1-).