I have just recently put on a comp cam with long tubes and all the good stuff. I am now recieving a 134 code about the bank 1 sensor 1 O2 sensor. I was wondering if there was a problem with my O2 extensions or has my sensor gone bad. I have checked the wiring and everything seems to be fine. I did have a problem of burning those wires earlier in the day and causing major problems but all else is fixed. Now i just have this light coming on pretty often. Just wanting some opinions!

 

Could be a problem with either the sensor or the wires. Switch the pre-cat sensors left to right and see if the problem follows the sensor (sensor problem) or stays where it was (wiring problem, or sensor not getting hot enough).