› Forums › Car Problems & Maintenance › Chevrolet › Why does my 2003 Silverado show P0420 & P0430 codes?
May 14, 2025 at 7:24 pm
#1444
Dennis
Need to get ir fixed. Smog checks are coming to a stop. Bills being passed to end the smog checks. Need to look into this. I know it’s close to end.