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Oxygen sensor testing. Wiring diagram confusion

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Hello forum!


I'm having a bit of trouble interpreting the wiring diagrams. Which heated oxygen sensor wire on the diagram is the signal wire? VS+?

Is there somewhere the meanings of these abbreviations?

What do the rest of the wire abbreviations for this sensor mean?



Many thanks in advance to those who answered.

Since I don't know much English myself, it's quite difficult to figure out what these abbreviations mean.

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