P0430 & P0420. I took it to the dealer and still get the code intermittently. What else I can do?

Question

The dealer told me to clean the acceleration module. They checked both catalytic converter and were fine. They didn't notice anything wrong with the oxygen sensor.

Answer 1

P0420 Catalytic below threshold Bank 1

P0430 Catalytic below threshold Bank 2

The amount of miles on the vehicle does matter, it may be time to have a tune up where the sparkplugs are replaced ,and as well as the leaning of the throttle body, this may help with the intermittent code condition that is occuring