engine light code p0420

  1. profile image48
    ptriderposted 7 years ago

    engine light code p0420

    pt crusier engine light

  2. porcupine73 profile image61
    porcupine73posted 7 years ago

    That's catalyst below efficiency. It is not at all uncommon on older cars. Typical causes can be faulty front or rear oxygen sensors. Tiny pinhole leaks can also cause this code. Or the catalysts themselves may be spoiled. Hope it is not the catalysts because those are expensive to replace.

  3. Emissionguy profile image83
    Emissionguyposted 7 years ago

    This is catalytic converter failure. You may want to check out this hub about it for details.

    http://hubpages.com/hub/Catalytic-Conve … or-Dummies