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1998 toyota 4runner what is the easiest way to fix this code po420 bank 1 sensor 1 catalyst efficiency below threshold

775 Views 1 Replies Latest reply: 2023-04-28 12:53:47


  •   Level 1   
    (5) points
    mike southern
    2023-04-06 09:42:35
     what is the cheapest way to fix code po420 catalyst system efficiency below threshold bank 1 sensor 1
    Reply

  •   Level 9   
    (3777) points

    2023-04-28 12:53:47 (Reply to:mike southern)

    Hi, the cheapest way is to inspect the engine for possible light exhaust leaks near or
    around the catalyst.
    Reply
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