Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
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Disconnect 4-pin connector (green) for O2S -G130- (arrow).
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Check wiring for open circuit between ECM/test box and 4-pin 02S harness connector (to ECM).
Connector terminal 3 to ECM/test box socket 51
Connector terminal 4 to ECM/test box socket 52
Specified value: max. 1.5 Ohms
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Check wiring for short circuits between terminals of 4-pin connector.
Connector terminal 4 to ECM/test box socket 51
Specified value: Infinity Ohms
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Check shielding wire for short circuit to sensor wires.
Connector terminal 4 to ECM/test box socket 14
Connector terminal 3 to ECM/test box socket 14
Specified value: Infinity Ohms
If wiring is OK:
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Replace Motronic ECM -J220-. See: Computers and Control Systems/Engine Control Module/Service and Repair
O2S wiring, bank 2 sensor 2, checking