Went to the dealer early Sat morning, they said code shows both cats bad and they said should replace all four sensors at the same time.

I bought the truck an '06 as a certified used in April '07 but in service was July '05. So 3/36 expired July '08. Certified used added 3/3 to the 3/36 so my bumper to bumper doesn't expire for 10 days so all work will be N/C.

They have to order cats so truck won't be ready till Tues.

I still don't understand cats going out @30K.