I Got this code the other day P0430 Cat system below threshold bank 2.....so I got a new Cat put on. Solved he problem for 3 days and then the light came on again, with the same code. Is there anything else this could be? Could this cat go bad that quick? there has to be some thing else ????

 

could this code mean something else?

 

Yeah, it means that the O2 sensor is not reading correctly or that you have an exhaust leak in front of the O2 sensor. This would be the O2 sensor behind the cat. Since you've replaced the cat already, I'd suggest replacing the O2 sensors in front and behind the cats.

 

What side did you replace ? Drivers or Passengers ?