Question

I have a 2001 Hyundai Sonata with engine codes P0430 and P0420, what can I do to repair these codes?

Answer 1

HI there,

These codes are for the bank 1 and bank 2 catalytic converters working below threshold. This usually means the converters are needing replacing. However, when you are running codes for both banks it can be caused by other issues. Possibly it's time for a tune up, or the car has low fuel pressure or bad fuel.

Answer 2

P0420 HYUNDAI - Warm Up Catalyst Efficiency Below Threshold Bank 1
Read more: https://www.autocodes.com/p0420_hyundai.html

P0430 HYUNDAI - Warm Up Catalyst Efficiency Below Threshold Bank 2
Read more: https://www.autocodes.com/p0430_hyundai.html