HELP !! P0430 code

Discussion in '2011+ Mustang GT 5.0L Tech' started by Steven210, Aug 3, 2022.

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  1. Steven210

    Steven210 Junior Member

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    the only problem is they cost so dang much lol. Might be easier to turn off lol
     
  2. Pentalab

    Pentalab forum member

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    Most, if not all tuners will no longer shut off the rear O2 sensors in software.
     
    OX1 likes this.
  3. Juice

    Juice forum member

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    Non foulers for the rear O2 sensor.
    What year is this car? What processor code? (The 4 difit code on PCM sticker)
     
    Last edited: Aug 11, 2022
  4. OX1

    OX1 forum member

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    You can run catless with these and not get a code, but monitors won't set, unless you put cats back.

    http://www.bigdaddiesgarage.com/mini-cat-cel-fix.html
     
  5. RED09GT

    RED09GT Equal Opportunity Offender S197 Team Member

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    Can the copperhead ECU pick up the use of the 1MOhm resistor/1 mircofarad capacitor combo low pass filter as a fake signal? Some toyotas use the downstream O2 sensors to calibrate the upstream wideband sensors.

    It was the only effective solution for the P0420 code on my SVT focus with a "race" metallic spun converter. Might be worth the $5 in parts from a local electronics sore to find out.
     
  6. Steven210

    Steven210 Junior Member

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    Ok so here’s an update.
    Last Friday I replaced the pcv and tightened the loose bolts on the valve covers and checking the hoses from the Intake tube, drove the car all week with no codes popping. Saturday afternoon the light comes on and it’s P014A. this car is driving me crazy.
     
  7. Juice

    Juice forum member

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    Have you replaced the upstream o2 sensor?
    If not, swap them between banks, and see if the code 'moves' with the sensor.
     
  8. Steven210

    Steven210 Junior Member

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    Yea I replaced it.
     
  9. Steven210

    Steven210 Junior Member

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    So after a week of not coming on, the engine light came on. Scanned it and p0420 & 430 came back. I attached a picture of what the scan tool said. What does that mean?
    Is this something I’ll probably have to take into the dealership to diagnose?

    EDFAE2A5-AAF1-4D40-BCA0-EDFF4CAAACC0.jpeg

    EF802B65-1F8B-45C3-9F42-97216DC825DC.jpeg
     
  10. Juice

    Juice forum member

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    420& 430 is flagging both converters.
    Worn out or pcm not happy with aftermarket converters.
     
  11. jewc75

    jewc75 S197 Junkie S197 Team Member

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    Id say the pcm isnt happy with that aftermarket converter. Its reading an old one vs a new one.
     
  12. Steven210

    Steven210 Junior Member

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    So even though bank 1 is still the original CaT, the new aftermarket cat on bank 2 will trip a code for both?
     
    Last edited: Aug 16, 2022
  13. Juice

    Juice forum member

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    420 is one bank, 430 is the other.

    Did you not put on the aftermarket because you got a P0430 code? So your OEM cats were worn out, but you only put on one side, AM, that the computer does not like.
     
  14. Steven210

    Steven210 Junior Member

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    Yes I originally only replaced one side, the bank 2. P430 code was the only one popping up at the time

    so try replacing it with an OEM?
     
  15. jewc75

    jewc75 S197 Junkie S197 Team Member

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    Id replace the other with an aftermarket as well.
     
  16. Juice

    Juice forum member

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    An OEM midpipe or, AM that is EPA certified.
     
  17. Steven210

    Steven210 Junior Member

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    So possibly since the two are different, the computer is not liking it?
     
  18. jewc75

    jewc75 S197 Junkie S197 Team Member

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    From what im reading yes.
     
  19. Steven210

    Steven210 Junior Member

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    That’s crazy but I can believe it. I guess it’s worth a shot to try.
     
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