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Question: 410 and 420 error codes

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zakthedog, V6, Aurora, CO, March 02, 2010, 15:12
 Rookie

what does it mean on code errors of, secondary air injection system malfunction and catalyst effeciency below threshhold bank 1 and how do I repair the problem to clear my check engine light

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  • Answer #1

    Bret Bodas from RepairPal Test Shop, March 02, 2010, 15:18
     Master

    P0410 Secondary Air Injection System Malfunction
    P0420 Catalyst System Efficiency Below Threshold (Bank #1)
    Here is some info on the P0420 code: http://repairpal.com/OBD-II-Code-P0420
    The P0410 code will require an inspection and functionality test of the air pump system. Visually check for vac hoses problems, but other than that you'll need to special tools and an understanding of how the system works to diagnose any further.

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