Hi all. new to the site. I have a 2002 blazer 4.3 with a p0155 bank 2 sensor one heater circuit code. I checked the resistance in the sensor and the heating element is good. I pulled the connector apart at the 8 pin connector on the right side by the a/c lines right side of motor. In looking at a electrical diagram, it shows a pink wire for battery voltage which I have and it is hot. However, this only goes to the post cat sensor. On this Eng, there are two green wires that go to bank 2 sensor one. In checking wire integrity (ohmd) from the connector to the sensor all wires are intact. One green wire goes down into the loom to the Eng, and the other goes to the PCM. Checked from connector to PCM, wire is good. could not find where wire in loom to Eng goes. KOEOff neither wire is hot. put test light to both terminals with ground on pos post battey, and test light lights up on both terminals indicating both wires going to grnd. Tried KOENOn and no change. Does the pcm drive the power to that sensor and when it goes into closed loop, turn it off. If not, where would the power come from? I am Stumped. Thanks for any help.

 

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