1997 K1500 Silverado O2 Sensor Problems

I have a 1997 Chevy Silverado Pickup with a 350. 125,000 miles with no modifications. I have been getting a PO141 Code and the check engine light stays on. I have replaced the O2 sensor Bank 1 Sensor 2 that it refers to. I have been told that is the drivers side O2 Sensor after the cat. This sensor has been replaced twice and still same error code comes back up after being reset. I have been told that I have a wiring issue. Does anyone have any ideas on this issue or know where i can find a wiring diagram of this area so that I may test each wire? Any help would be greatly appreciated. I have tried and tried with this and am losing patience. :banghead:

The P0141 is for H02s bank 1 sensor 2. Bank 1 is the drivers side exhaust system and sensor 2 is the one after the cat. However some light duty 5.7 truck exhaust pipes cross just aft of the engine putting the bank 1 cat on the pass side. So, are you sure the correct sensor is getting replaced?

There are 3 wires. The pink one is 12 volts in the run position to heat the sensor and is powered by "ENG 1" 20a fuse #21 in the underhood fuse box. the other two wires are reference signals to the VCM.

Keep in mind that this info is out of my '98 C/K manual. Your '97 may be different. Hope this helps.........Steve

Thank You so much for all of your help. Sure enought that was my problem. I had replaced the O2 sensor according to what everyone else had told me. I replaced the opposite side rear sensor and my idle went back to extremely smooth. Now we will see how the gas milage goes back up. I thank you so much for the help!