P0139, P0172, and P0234

Discussion in 'Mazdaspeed 3 Troubleshooting' started by jsmith, Oct 1, 2018.

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  1. jsmith

    jsmith Silver Member

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    Codes are:
    P0139 - 02 Sensor Circuit Slow Response
    P0172 - Fuel System too Rich
    P0234 - Engine Overboost Condition

    I am guessing its the MAF, as the STFT/LTFT readings suddenly jump to/from large and static values.

    Cold start idle log is attached.

    Any input, or past experiences with similar issues would be appreciated.
     

    Attached Files:

  2. neganox

    neganox Feline Führer Moderator Platinum Member

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    If you hold the throttle a bit while cranking to bypass the cold start routine, do the codes appear again?
     
  3. jsmith

    jsmith Silver Member

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    The cold start routine is pretty neutered via the tune.
    I'll give it a try, but so far the codes have reappeared across battery pull resets.
     
    jsmith, via a mobile device, Oct 2, 2018
    #3
  4. 5doorsoffury

    5doorsoffury Greenie Member

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    Did these just pop up out of no where or did something happen? How does it drive. It may be the rear o2.
     
    5doorsoffury, via a mobile device, Oct 3, 2018
    #4
  5. jsmith

    jsmith Silver Member

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    Was pretty sudden. Car drove well enough before I parked it for a month or so. Car drives well enough as long as no WOT.
     
  6. neganox

    neganox Feline Führer Moderator Platinum Member

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    Turn those emission codes off. You're a Floridian.
     
    neganox, via a mobile device, Oct 3, 2018
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  7. jsmith

    jsmith Silver Member

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    MAF and BPV cleaned. Rear O2 replaced. I thought that the rear O2 was just for emissions?
     

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  8. Mauro_Penguin

    Mauro_Penguin Punk in Drublic Gold Member

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    Have you checked your tire pressure?
     
    Mauro_Penguin, via a mobile device, Oct 3, 2018
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    • Like Like x 1
  9. jsmith

    jsmith Silver Member

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    With only the finest of analog tire gauges. My right tire pressure was 1.5psi off of my left when viewing. Why do you ask?
     
    • Like Like x 2
  10. Mauro_Penguin

    Mauro_Penguin Punk in Drublic Gold Member

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    No reason, just being stupid.

    With the issues that you and Raider are having, I wonder if I should change mine for good measure....
     
    Mauro_Penguin, via a mobile device, Oct 3, 2018
    #10
  11. neganox

    neganox Feline Führer Moderator Platinum Member

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    Weird. I assume the codes went away?
     
  12. Raider

    Raider Administraider Administrator Platinum Member

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    There is a good chance my car passed on an extra demon to possess your Speed.
     
    Raider, via a mobile device, Oct 3, 2018
    #12
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