I just got done rebuilding my 5.3 out of the 2007 Trailblazer. Now I've got it all put back together and I've got codes 171 and 172 and that is all I have, I think its the cord to my 02 Sensor wire for bank one. Can it be anything else? I did notice that it looked like the wire got squished not the connector but just the wire itself that is on the harness not the sensor. Its 171 which is bank one lean and 172 bank one rich Thanks for the help!