I got the code off my jeep, the code is p0135 (bank1 sensor 1 the o2 sensor i guess on drivers side cylinder 1 i was told.) How can i tell it is bad it's a little weird that this code is coming up after i lowered my t-case but i guess things happen that way. Can you tell me which sensor it i have 4 of them and they are all on the drivers side. <img src="/forums/images/graemlins/patriot.gif" alt="" /> <img src="/forums/images/graemlins/patriot.gif" alt="" />