Passat Wagon L4-2.0L (ABA) (1995)
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Separate 4-pin HO2S harness connector.
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Check wiring for open circuits between test box and 4-pin connector, according to wiring diagram.
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Terminal 3+socket 42
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Terminal 4+socket 20
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Wire resistance: Max. 1.5 Ohms
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Check wires at 4-pin connector for shorts to one another.
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Terminal 1 and test box socket 20
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Terminal 1 and socket 42
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Terminal 2 and test box socket 42
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Terminal 2 and socket 20
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Terminal 3 and test box socket 20
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Specification: Infinity Ohms
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Check shielding for short to HO2S wiring according to wiring diagram.
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Terminal 3 and test box socket 56
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Terminal 4 and test box socket 56
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Specification: Infinity Ohms
If the specifications are not attained:
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Check wiring according to wiring diagram.
If no wiring malfunction is detected:
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Replace heated oxygen sensor G39.