Question

P0430 AND P0420 Lexus -2005 330 RX

Answer 1

Hi there,

These codes are for bank 2 and bank 1 catalyst below efficiency. I would clear the codes and then try either a different brand of fuel or a higher grade and see if the codes come back. Sometimes the detergents and additives in the fuel can cause these codes to come up. It's more likely then both converters failing at the same time.