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2006 sienna throwing codes p0420 and p0430 126500 miles cleared twice air filter was dirty and checked gas cap gasket. was is next least expensive option?

Vehicle: 2006 Toyota Sienna 3.3L v6

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P0420 Catalyst system efficiency below threshold Bank 1

P0430 Catalyst system efficiency below threshold Bank 2

There is only one step that is preventive maintance,126500 this is still a young engine, What cause this is the least expensive route, Check for tune-up,  and the engine performance,Catalytic convertor do degrade from mileage , 126 thousand is still young, What ever cause it to degrade should be corrected before install a new catalytic.

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