If the vehicle was manufactured after federal EPA requirements for them went into effect, yes.
P0420 is a Catalytic Converter efficiency failer. More than likely you will need a new Catalytic Converter.
Yes, you have to have a catalytic converter in every state if the car came equipped with one when new. It is against federal law to remove one.
No.
A catalytic converter can be ruined by a engine that is missing and dumping raw fuel into the converter.
If the vehicle came from the factory with a catalytic converter is illegal to remove it. It will also not run properly without the catalytic converter install.
Not normally.
A shop can cut the bad converter out and weld a new one in.
It is ILLEGAL to remove the Catalytic Converter without replacing it with a new one.It is ILLEGAL to remove the Catalytic Converter without replacing it with a new one.
First off it is illegal to remove a converter without replacing it with a new one. This is a job best left to a muffler shop if you need a new converter.
If the car is buit after 1996 you will need to install a new catalytic converter to get check engine light to go out if the code is for the cat.
Then you need to replace it with a new one. A broken converter will allow carbon monoxide into the passenger compartment, and will kill you. It is illegal to remove it and the engine will not run right with it removed.
take it too a recycling place and get a new one!!