The plug think it's 5 wire that the actual sensor goes into. Ok Joe as far as I know I did everything correctly, got everything wired up right, got power, I went into setting on flashscan and set it up like tutorial said, even went into EE and set it up there. I went to Diagnostics and looked at external sensors, and set it up for 0-5V, it looked like one might be there but then went to data logging and display WBo2 and nothing, went to free air calibrate and said nothing there. I tried to swap the Tx and Rx just incase it was wired wrong, and nothing. So I have no clue. When I had it hooked to my PC it kept giving me an error for something saying no real time data available or something like that.