Passat GLS Wagon L4-1.8L Turbo (AUG) (2001)
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Use adapter cables from VAG 1594 to connect multimeter to terminals 3+4 (Motronic ECM connector) for voltage measurement.
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Start engine and measure primary voltage. Specification: 0.40 to 0.50 volts
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Switch ignition off.
If specified value is not obtained:
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Test oxygen sensor wires.
If specified value is obtained:
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Replace Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC) -G130-.
Check oxygen sensor wiring for oxygen sensor 2
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Connect VAG 1598/31 adapter cable to control module wiring harness. Engine Control Module (ECM) is not connected.