1999 Honda Odyseesy code P0420

Discussion in 'Odyssey' started by Optimus Prime, Oct 6, 2010.

  1. My 1999 Honday Odyssey keep getting the P0420 engine warning light
    code despite the fact I changed both of the O2 sensors and the entire
    catalytic converter.

    I called Honda and they say really the last step is to re-flash the
    computer. That sounds drastic to me. Before I do that I want to ask
    the experts here: what else can cause this?
    Optimus Prime, Oct 6, 2010
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