Jetta L4-1.8L Turbo (AWD) (2000)
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Remove protective cover -arrows- and separate 4-pin connector (brown) to Oxygen sensor after catalyst (G130).
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Check probe heating for continuity at Oxygen sensor connector contacts 1 and 2.
If it is determined that probe heating has an open circuit:
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Replace the Oxygen sensor after catalyst (G130).
If probe heating has continuity:
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Set multimeter to measure voltage and connect to contacts 1 and 2 on connector to control module.
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Start engine and run at idling speed.