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How to address P0430 P0420 and high fuel

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here How to address P0430 P0420 and high fuel

This topic contains 5 replies, has 3 voices, and was last updated by Billy Billy 1 year, 1 month ago.

  • Creator
    Topic
  • #894216
    sh_ksa
    sh_ksa
    Participant

    Hello everyone,

    I’m hoping for your input and opinion about this

    CAR: Explorer 2013 V6 standard

    Symptoms:
    P0430 P0420 which is the catalytic converters are below efficiency threshold. Both sensors readings are about 0.74 constant when car is idling at full stop.
    Higher than average fuel consumption for my driving conditions and style. Getting 15-16 mpg.
    Car rarely feels like about to stall when come to a stop and it did a couple of times.
    Other than that, the car is normal and there is no misfire in the engine

    Things I did to help with the fuel consumption:
    Used a fuel system cleaner from bg.
    Changed engine air filter.
    Changed spark plugs.

    Form what I gathered searching and looking for possible causes are 2 possible issues for the codes and the higher than average fuel consumption:
    1. A vacuum leak.
    2. Fuel system pressure.

    My questions are:
    1. Will a vacuum leak trigger the CEL and specific code or not in my car?
    If yes, it means that I don’t have a vacuum leak and I should look somewhere else.
    If no, is it possible that the vacuum leak could trigger P0430 and P0420 codes.

    2. Let’s assume I have a problem in the fuel system, higher or lower than normal pressure. Will that always trigger a code?

    P.S: Watching YouTube videos and reading articles online trying to diagnose a car issue could make you go banana sometimes.

    thanks

Viewing 5 replies - 1 through 5 (of 5 total)
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  • #894222
    Dave Tidman
    Dave Tidman
    Participant

    What are your short and long term fuel trims?

    #894227
    sh_ksa
    sh_ksa
    Participant

    here is the values:
    SHRTFT1=1.6
    LONGFT1=3.9
    SHRTFT2=2.3
    LONGFT2=3.1

    a follow up:
    the downstream O2 sensores are not constantly reading 0.75 at idel. it read 0.85 after just starting the car after a long park. it’s readings also jumping to very small values when revving the engine.

    #894233
    Billy
    Billy
    Participant

    Probably bad cats. An infrared thermometer will help verify.

    #894238
    sh_ksa
    sh_ksa
    Participant

    dose the fuel trim readings eliminate and possiblity for vacuum leak or fuel system issues?

    should I look for exhaust leaks?

    #894242
    Billy
    Billy
    Participant

    Pretty much.

    Sure.

Viewing 5 replies - 1 through 5 (of 5 total)

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