Honda civic check engine?

I drive a 2012 Honda civic ex with 53k miles on it. My check engine light came on and the code is p0420 catalyst system below efficiency what are my options?

I'm not positive. If could be that your catalytic converter is clogged and needs to be replaced. They progressively get worse until eventually the car won't run. That won't happen in the next 7 days - or even 30 days, most probably. It takes time. Take your car to a mechanic who works on exhaust systems. Maybe it is just a sensor going bad; I dunno for sure.

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