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2001 Prius - P0420

Discussion in 'Generation 1 Prius Discussion' started by albator, May 2, 2015.

  1. albator

    albator New Member

    Joined:
    Apr 30, 2015
    4
    1
    0
    Location:
    Bonny Doon, CA
    Vehicle:
    2001 Prius
    Model:
    I
    2001 Prius, 210k+ miles.
    Last week we got 3 codes:
    - Mass Air Flow: P3191
    - Misfire: P0300
    - Catalytic: P0420

    I removed the MAF sensor and cleaned it with a special MAF cleaner.
    Then reseted the codes.

    Today, P0420 came back.

    What's next?
    - spark plugs
    - PCV
    - air filter

    Should I change the downstream O2 sensor too?
     
    #1 albator, May 2, 2015
  2. kutcht1

    kutcht1 Member

    Joined:
    Nov 25, 2013
    295
    81
    0
    Location:
    Andover, Minnesota
    Vehicle:
    2008 Prius
    Model:
    N/A
    How does the car run? If the misfire is gone and the car runs good the pcv and air filter may just be a good cheap need to do anyway. Plugs are also easy to check so I would pulI one and check it's health. Iridium plugs last a long time. I had a P0420 that would come on intermittently for about 6 months in my 2002. The car ran great and was not burning oil so I figured it was not the catalytic converter. I then replaced my up stream O2 sensor and put the anti-fowlers on the rear O2 sensor. Both simple cheap fixes. The up stream is just a bit difficult to get to. Code never came back and I am not sure which one fixed it. If you are not burning lots of oil, I would try the O2 sensor and the anti fowlers.
    TomK
     
    #2 kutcht1, May 3, 2015
  3. C Clay

    C Clay Member

    Joined:
    Nov 24, 2012
    284
    52
    0
    Location:
    Lexington, KY
    Vehicle:
    2014 Prius
    Model:
    Four
    What is an anti fowler?


    iPhone ?
     
    #3 C Clay, May 13, 2015
  4. kutcht1

    kutcht1 Member

    Joined:
    Nov 25, 2013
    295
    81
    0
    Location:
    Andover, Minnesota
    Vehicle:
    2008 Prius
    Model:
    N/A
    It is a spark plug anti fouler. There are threads on how to do this as one needs to be drilled out and the two are put together to set the sensor further away from the exhaust gases. I spelled it wrong originally. I think this is the set I bought.


    TomK
     
    #4 kutcht1, May 14, 2015
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