Trying to figure out if I have vacuum leak, a fuel system issue, ignition system issue, or failed catalytic converters on my 2006 PF 4.0. P0420 Is the only warning light coming on. However, I am trying to go from, least expensive issues to "F#@K... It cost how much to fix?"
I do have a blue tooth scanner plugged in and I am running the Throttle App. Got the O2 V meters going but not sure what else to monitor to help with the diagnosis.
I love my Pathfinder, and have owned it since the odometer was on 28K. Now it is pushing 160K. I have already done quite a few repairs to keep it going. New Transmission, front cats replaced and the even got the radiator replaced under the recall. I am willing to fix whatever is wrong, I am on a budget so throwing money at it till the code goes away is not an option. Can someone help me out?
Thanks!