I keep getting a random P0420 on my (soon to be my sons 1st car) 2007 Honda Accord 4cyl. All the dealers keeps saying catalytic converter needs to be replaced. If that is the case we might do a cat delete since emission tests are no longer required here. But I have, on past cars, had luck with just changing the O2 sensors and has solved this issue. Any info or old school knowledge would be appreciated. I just wanted to get another opinion before spending too much or getting ripped off. We can do most work ourselves. Thank you all in advance. My son and I always appreciate all of your alls input and info.