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code p0430

This is a discussion on code p0430 within the Computer & Tuning forums, part of the LSx Technical Help Section category; i have a check engine light on in my '04 sierra the scanner gives me a trouble code of p0430 ...

  1. #1
    Junior Member
    Join Date
    Apr 2008

    '04 sierra

    code p0430

    i have a check engine light on in my '04 sierra the scanner gives me a trouble code of p0430 can anyone tell me what that code is?

  2. #2
    Senior Member
    Join Date
    Jul 2005
    Jacksonville, FL
    Catalyst System Low Efficiency Bank 2. Usually means the cat took a dump (passenger side). Take a look at it for any discoloration from overheating, rattle, exhaust leak near the sensors, check wiring/connector for any damage. On F-bodies some people swap the rear 02's side to side, clear the codes, then see if the code moves to bank 1 throwing P0420. If it does it's the sensor, if P0430 returns it verifies a problem with the cat. Hope this helps and welcome to the board.

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