Question about 2002 Mazda MPV

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I have a 02 Mazda MPV. I unfortunely washed the engine off with a garden hose. Tried starting the engine didn't start, noticed a red glow under the car. Stopped trying to start it. Call repair shop. That was 2 yrs ago now and to much money, and didn't get the car fixed. Got a waver for the vehicle registration last year, had to spend $200 minimum. I have (2) OBD codes: P0421 and P0431- Warm up catalyst below threshold, bank 1 and bank 2. What do I need to do/replace?

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  • murphykp33 Sep 10, 2010

    Thanks jturcotte, that was quick.

    I had the water removed from the plug chambers, new plugs, wires, flex pipe exhaust P/N 40-050 from Mazda w/ O2 sensor on it and the O2 sensor, and a aftermarket catalytic converter (don't remember which one). Another shop could tell if a cat was replaced (another dilema).

  • murphykp33 Sep 10, 2010

    don't think injectors were looked at.

  • murphykp33 Sep 10, 2010

    sorry for the confusion.
    The car is running fine other than the error codes.

  • murphykp33 Sep 10, 2010

    Do you have any idea which Catalytic converters and or O2 sensors do I need to replace.
    Bank 1 and Bank 2, I don't know the locations.



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Seems your car is dumping gas into the chambers. Do you smell gas at exhaust pipe? Codes are coming from O2 sensors. You seem to have 2-stage catayltic conversion, and the first ones are trying to burn the gas but cannot do a good job of it--too much gas. There is where you get the red glow. I'm only guessing, but I wonder if the injector system shorted during the garden hose incident. Was that looked at while you were paying out all your money?

Posted on Sep 10, 2010

  • 2 more comments 
  • Jeffrey Turcotte
    Jeffrey Turcotte Sep 10, 2010

    Hmmm...I don't understand these repairs. You say the car will not start, right? But none of these repairs would affect the start. Does the car start now or not?

  • Jeffrey Turcotte
    Jeffrey Turcotte Sep 10, 2010

    OK, and that catalytic part is not glowing anymore, or does it still glow?

  • Jeffrey Turcotte
    Jeffrey Turcotte Sep 10, 2010

    I will have to study this a bit more later. I have an appointment with my wife right now...

  • Jeffrey Turcotte
    Jeffrey Turcotte Sep 11, 2010

    After further thinking/research, I have another question and some recommendations.
    Do you have the results of the emission test and can you send them to me here?
    I would also like to know what your fuel mileage is.
    Before replacing more parts, I would recommend a thorough test using a scan tool that will record the output of all 4 O2 sensors over time from a cold start to operating temperature.
    If you know someone that has a good scan tool, perhaps you can get this data for free.
    I still think the problem is with the engine running rich and not with the catalytic converters, but the O2 data will settle that issue for me.
    Sorry I can't solve this easily for you.



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