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Which O2 wire is signal? S70 1998

posted by  someone claiming to be Gavin Lim on  Thu Apr 12 16:58 CST 2001 [RELATED]

I'm trying to install an A/F meter and saw 4 wires from the O2 sensor (front only) namely black, grey and 2 whites. Which is the signal wire that I need to tap? I believe two wires are for the heater rite?







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Re: Which O2 wire is signal? S70 1998

posted by  someone claiming to be Jeff S on  Mon Apr 16 02:14 CST 2001 [RELATED]

Disclaimer: Don't cut any wires based on what I say!

I am pretty sure (like 90%) that the 2 white wires are for the sensor heater, the grey is ground and the black is the signal wire.

What I would do is back probe the wires in the O2 connector with a multi-meter and blimp the throttle (usually the O2 sensor connector is disconnected). The signal wire is the one that changes voltage (between 0 and 1 volts) when you hit the throttle.






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