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Engine the infamous 420

Discussion in 'Powertrain' started by felixrolla, Jun 14, 2005.

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    felixrolla Guest

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    the infamous 420

    how have people dealt with code po420? I'm getting it all of the sudden
    felixrolla, Jun 14, 2005
    #1
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    ChristianVA New Member

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    CHeck you o2 sensors if they are fine and runing cat is clogged up.
    ChristianVA, Jun 14, 2005
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    Vamp Gunmetal 2001 Corolla S

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    Time for a new cat.
    Vamp, Jun 14, 2005
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    felixrolla Guest

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    this isn't the one related to the MAF? ughhhh. Could this be related to my 03 engine?
    felixrolla, Jun 14, 2005
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    TRD Rolla New Member

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    po420? please explain what it is?
    TRD Rolla, Jun 15, 2005
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    ChristianVA New Member

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    a catalytic converter malfunctioning.
    ChristianVA, Jun 19, 2005
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    felixrolla Guest

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    well, I think that during one of my cleanings, I bent the MAF. So I changed it, and no CEL so far (couple days).
    felixrolla, Jun 19, 2005
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    felixrolla Guest

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    ugghh

    it's back... p0420. does anyone use one of those eliminator devices?
    felixrolla, Jun 27, 2005
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    Turbo1zz New Member

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    You're getting this code because the ECU is reading an abnormal voltage from the post cat o2 sensor. This is most likely from a clogged cat or a faulty o2 sensor.

    Replace the cat and have the post cat o2 sensor checked out. This will eliminate the CEL from coming back again.
    Turbo1zz, Jun 27, 2005
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    felixrolla Guest

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    so... there is no way that it could be the fact that the engine is now 03? I was thinking maybe i could try to do the TSB ECU flash, since my ECU serial # falls into the category of flashible ECUs....
    felixrolla, Jun 28, 2005
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