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Hope somebody can make sense of this!

I need to tap in to the 'O2 Sensor signal wire' on my NB8B. There are 4 wires on the NB8B O2 sensor...does anybody know which one I need or what the 4 wires do?

There's one signal (+), one earth (-) and one 12V pair for the sensor heater. It's more common to tap in back inside near the ECU. Looks like that's pin 4W on an NB8B.

Brilliant answer. Thank you Manga!