I have a 99 dakota with the 5.2 and need to know the the color of the wire comming from the upstream O2 sensor to the pcm. I have looked in the haynes book, it tells me a tan/white wire but it isnt there so im stumpt. any help would be awesome

 

According to dealerconnect, it should be a orange and tan

 

check the pin number... Unless you are looking for it somewhere else...

 

That diagram is for a 5.9 which is different from a 5.2. The 5.2 doesn't have any bank 2 sensors

 

Yeah 00dakrt I see what you are saying but I think you are right with the orange/tan wire...The only issue is it contently reads around 700-800mv and sometimes jumps over a volt all with no codes... I want to run my hydrogen kit but to do that i need to add voltage to the sensor with an efie and with it running so rich it makes more problems. hmmmm....

 

Well the sensor itself will only produce roughly 1 V. The PCM biases that signal with a 2.5V bias voltage. If you were to read the voltage with a scanner it should show between 2.5 and 3.5V but the signal is also constantly changing and while a voltmeter will show 700-800mv, its actually an average. The sensor really produces what looks like a sine wave.

 

Thanks thats some really good info that will come in handy.