I have Honda Accord 09 and my dealer said I need the catalytic converter replaced. My local shop asked me if I wanted to do both I do right?

I have Honda Accord 09 and my dealer said I need the catalytic converter replaced. My local shop asked me if I wanted to do both I do right?

Which both, and I would ask why the converter needs to be replaced since it will probably be very expensive.

There are alternatives and if you don't have car inspections in your state you might just let the light stay on. Your choice.

Get another opinion

It takes more diagnosis to determine why there's a trouble code. It's probably a cracked or loose intake hose. Have that smoke tested before considering changing cats. Go to a different shop and start over.

Was there a P0420 or P0430 code? If there was just replace the bad catalytic converter for that code.
If the converters are plugged up they need replacing and you need to find out what's wrong with the motor that caused the damage.

YES, replace both.