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  1. R

    2007 yukon electrical probs

    I have an 07 yukon that I’ve had nothing but trouble with since I’ve bought it seems like. We used it to go trick or treating and piled all the kids in the back and drove with the hatch open so they could hop in and out as needed, got a service suspension light. A few days later got service...
  2. R

    po430/420 codes

    Yes idling after a drive, someone stated they should be 5-600 degrees. What would cause them to go out with under 2k miles tho?
  3. R

    po430/420 codes

    I have a diablo tuner set on 87 econo tune and to disable the afm. 02s are tight, the cats are reading anywhere from 300 to 400 degrees after driving at operating temp
  4. R

    po430/420 codes

    The code keeps coming back after being erased, the cats have a 5 year warranty on them but not sure how easy of a process it is to get them covered
  5. R

    po430/420 codes

    All gaskets were replaced and only exhaust leak I have is at the y pipe flange after the cats and downstream o2s. The cats are only a few months old and don’t even have 2k miles on them yet. I will check the map sensor to see where it’s reading
  6. R

    2007 wiring question

    I have a 2007 flex fuel 5.3 yukon, been having problems with it throwing some codes, loosing grounds etc. I was checking everything over and noticed a red and black wire bundled up and taped to the loom. I attached some pics. Can’t figure out where it would go or what it’s for. Just looking for...
  7. R

    po430/420 codes

    They are AP Exhaust cats and y pipe, ordered them from rock auto. The correct o2s are in the correct spots and yes it is running downstream o2s. Everything got put back to during the afm delete. The motor seams to run fine other then losing about 2.5 mpg. A bad o2 crossed my mind at first then I...
  8. R

    po430/420 codes

    I have an 07 yukon 5.3, just did an afm delete and while doing that I replaced all sensors and put new cats on. I put about 1500 miles on it and now I am getting a po430 and po420 code which is low catalyst. Was told to try o2 sensors on the downstream o2s but that didn’t do anything. Anyone...

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