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P0430 err code on a 07 f150 5.4 truck runs fine 200k miles. But I'm getting err code. since it's running fine could it be oxygen sensor or cat. Conv. How can I tell?

Vehicle: 07 f150 5.4

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P0430 Catalyst sytem efficiency below threshold Bank 2

The catalytic uses a downstream 02 sensor when the catalytic degrade over time and mileage the downstream or catalytic 02 sensor begins to switch this indicated the catlytic is no longer able to function.There is always that possibilty its not the catalytic convertor this will involve the use of fuel trim data. Worn sparkplugs and a MAF (mass airflow) not reporting correctly (A MAF cleaning  restore this condition)  and even a vacuum leak can also set a P0430, without setting a lean code condition.

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