Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance P0420 Code, 99 SE V6

I have a 1999 SE Sport with the Duratec.

I was driving on 494 at about 50 mph and the CEL came one.

I took it to autozone and it reads a P0420. I think this code is something about the catalytic converter efficiency threshold.

I have 76,000 miles. Should I take this to the dealer. Is it covered under the 80,000 mile emissions warranty?