Ok here is the history, I have a 2000 Silverado since new, now she has 235,000 miles on her and runs great and very well maintained. I have came up with fault code P0157, Bank 2 Sensor 2 (O2 sensor) low voltage. The cat has been replaced O2 sensor has been replaced and i had some problems with the fuel pump losing "prime" and replaced it thinking that the pump was weak making the system run lean. THAT WASNT IT EITHER... Does anyone have any ideas or have experianced this problem or am I the only one on the PLANET?? I am going to be chasing wires to look for a broken wire?? I am officially stumped.. I have also read that the PCM could be "bad" but she would throw a fault code for the PCM..

PLEASE ideas would be great!! ill even message my phone # if need be

Mike

 

Which O2 sensor did you replace?