I have had a repetitive problem over the last several years with my 2000 DII fouling the same passenger side upper O2 sensor so I figure it is time to finally figure out the cause before I throw more parts at it.
I have an emissions test coming up and my truck is showing codes P0150, P0174, P1174 and P1590 (yes I have 3 amigos). I've done a lot of reading here and it appears the O2 sensor voltages are normal, but the bank 2 long term fuel trim is 25% (bank 1 is normal). I have interpreted this to mean I may have a vacuum leak that is causing my fuel trim to max out and run lean, throwing the P0150, P0174 and P1174 codes.
If any of the more experienced members can offer some advise on finding vacuum leaks, or most likely locations to check I would appreciate it. Also, if I am going the wrong direction here, feel free to straighten me out.
I have an emissions test coming up and my truck is showing codes P0150, P0174, P1174 and P1590 (yes I have 3 amigos). I've done a lot of reading here and it appears the O2 sensor voltages are normal, but the bank 2 long term fuel trim is 25% (bank 1 is normal). I have interpreted this to mean I may have a vacuum leak that is causing my fuel trim to max out and run lean, throwing the P0150, P0174 and P1174 codes.
If any of the more experienced members can offer some advise on finding vacuum leaks, or most likely locations to check I would appreciate it. Also, if I am going the wrong direction here, feel free to straighten me out.