Can any one tell me the wiring codes on both upstream and down stream o2 sensors? The wires I see on one o2 sensor are a total of 5 leads-their colors are black; blue; yellow; white; grey. On the other o2 sensor (exhaust) has a total of 4 leads, their colors are green; pink; white and black. I'm trying to diagnose the o2 sensors to try and find out if its faulty wiring some where or I in fact DO have a bad sensor. My question is which wire would I hook up to using a multi meter to basically see what the computer is seeing? Thank you.
the pink and white is the heater circuit. and the green and black is for the sensor.
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