Code p0420

I looked up the code in our online guide. Attached are the notes from said code. Let me know if you need more information. One of the sensors probably needs replacement.

I've seen this code a lot and there are just 2 things that i've ever seen set it

Bad converter 95%
Exhaust leak ahead of the converter 5%

Thanks for the reply!
How would I be able to tell if its a leak?

You put it up on a lift with the engine running and carefully feel all around until you feel the air puffing.

its not a leak, the car has two catalystics how can i tell witch one it is? and it only has two sensor :/.

P0420 applies to bank one if you have a V6. That is the only bank if you have a 4 cylinder. It will be the converter just ahead of the downstream sensor. The sensor could be right in the converter itself.

thansk for your answer, so then i shouldnt think its the converter attached to the manifold ?

The one between the 2 sensors is the one being monitored.