I have a 2002 Protege 5 and I'm trying to hook up a air/fuel gauge. I know where the O2 sensor is but the problem is I dont know which wire to connect it to. There are 4 wires. 2 blacks, 1 white and 1 blue. I believe the black ones are for ground so it's either the white or the blue one. If any knows which wire it is, can you please reply or e-mail me at err1@***.net. Thanks and peace.

 

i think i hooked mine up to the blue one. hmm yeah it was the blue one.

 

thanks for the reply, ill try it on my car and let you know if that works.