O2 Sensor Help
 

Ok Folks hello! I need some input here! I think I may have replaced the wrong 02 Sensor! I have a Chevy S10 04 with the Vortex 6cy 4wd “I love the truck”. I have had very little problems with it since I bought it new! Now I thought Bank 2 sensor 1 was the sensor just before the CAT! Were would be the fuse for the 02 sensor “if it has its own fuse”? Po155 is my code any help would be appreciated! I did replace the o2 sensor got replaced with a Bosch from Autozone!

Thanks again,
Tom
ps I did look through the history of the forums and could not find anything to help me, and so here we go!