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P0430 error code

This is a discussion on P0430 error code within the External Engine forums, part of the LSx Technical Help Section category; Okay the p0430 error code popped up after I got my coolant sensor fixed and exhaust adjusted at a shop. ...

  1. #1
    Moderator 98TransAmWs-6's Avatar
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    98 TA WS6/ 01 C5 Corvette

    P0430 error code

    Okay the p0430 error code popped up after I got my coolant sensor fixed and exhaust adjusted at a shop. What would cause this? The exhaust system is obx lts and y-pipe ,high flow cats, and slp loudmouth. My exhaust is only 1 month old. So how could my cats be clogged? At higher rpms it back fires or sounds like it but I don't see any smoke. Any help would be appreciated.
    Last edited by 98TransAmWs-6; 10-01-2010 at 07:15 PM.

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    Drk Blue
    2000 WS6 T/A Convertible

    I have had this issue myself a few times. Once it was bad 02 sensors that weren't reading properly behind the cats throwing that code. The other time it was actually a bad spark plug the caused the fuel trims to change enough that I got a backfire sound and an occasional mis-fire. Just replaced and it worked fine.

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    Junior Member
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    Drk Blue
    2000 WS6 T/A Convertible

    I have had this issue myself a few times. Once it was bad 02 sensors that weren't reading properly behind the cats throwing that code. The other time it was actually a bad spark plug the caused the fuel trims to change enough that I got a backfire sound and an occasional mis-fire. Just replaced and it worked fine.

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