Hello all, my Check Engine light came on yesterday. I went by Advance Auto for there free scan. It came up with a P0134 O2 Sensor code ( Bank 1 Sensor 1). Ok so I know that it is the sensor but since I've never replaced one of these can anyone tell me which one this is. I know that there are 4 of them front and back but I don't know with the code above if it is the back ones or front. Is there a drawing anywhere out there as to show me exactly where they are. Thanks for your help. Looking to buy the part today. 10-06-05