If you think the catylist is ok check your 02 sensor instead. P0420 is about the convertor and maybe water got in your tank fron filling it at a fuel stop with low reserves in their tank. They all do have water in their tanks. If you like fill your tank and the disconnect your battery for 15 minutes. reconnect it and drive the car 50 miles or more on the highway. This may clear your codes out
Cat might be burnt it might be a bad sensor or a broken wire in the o2 sensor
P0420 :catalyst system efficiency below threshold [bank 1] either- one of the o2 sensors is bad -cat converter bad -exhaust/manifold leak--or engine coolant tempature sensor is not working properly test both sensors -check for exhaust leak -or may have to replace cat converter
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