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Reply To: Why does my 2003 Silverado show P0420 & P0430 codes?

› Forums › Car Problems & Maintenance › Chevrolet › Why does my 2003 Silverado show P0420 & P0430 codes?

May 14, 2025 at 7:25 pm #1450
Matthew

    Put O2 spacers on the rear o2 sensors.

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