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  1. P0421 Error Code - 2010 Mazda3 - Help?

    Started by tommyx2, 01-11-2015 06:28 PM
    catalyst, ecu, obdii, p0421
    • Replies: 4
    • Views: 5,057
    Last Post: 07-29-2015 10:43 PM
    by tommyx2  Go to last post

    Forum:
    Engine & Drivetrain

  2. P0421 Code won't go away!

    Started by paultt, 09-05-2011 03:29 PM
    cat, emissions, engine light, o2 sensor, p0421
    • Replies: 15
    • Views: 13,876
    Last Post: 01-16-2014 07:08 PM
    by timezwasting  Go to last post

    Forum:
    Problems with the Mazda3

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