P0430 Dodge -

Question

check engine light and po430 code comes on fo about 2 days then the check engine light will go out for about 2 days and then back on

Answer 1

P0430 Catalyst system  efficiency  below threshold (Bank 2)

Was there a 02 sensor that was recently replaced? If there was a rear 02 sensor replaced with a aging front 02 sensor this can cause a catlaytic code condition. Come on for 2 days then goes out for abut 2 days , this would make it intermittent condition. causing P0430 to occur, exhaust leaks prior to the front  02 sensor can cause a catalytic code condition.