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any body know what wires are what on the o2 sensor on my `98 outback DOHC 2.5, ?.
colors i got on plug ( male) are :
yellow / red
white
black / white

i put DMM lead on engine earth , an got + 12v on yellow / red wire , on o2 plug , but what are the other 2 ? which one is for the signal in, and heater earth. engines been wired up with a aftermarket sensor , two whites and black , i know the whites are heater, and black signal out.
 
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