I have a 2006 Dodge Grand Caravan. With 79,950 miles on it, the check engine light came on while on vacation. Took it into a shop and they charged about $100 to diagnose it as a P0420 bad Cat. Con. code. Drove through vacation week and then the light went off. I now have 82,000 miles on and the light came back on with same code. If I take it into a shop with original paperwork showing bad cat. conv. before 80,000 miles will this be covered under warranty?

Federal warrenty is 8-year/80K miles on OEM Cats.
$100 is way too much for a test, the P0420 already tells me that the cat is bad.
Do a Google ''Youtube Auto catalytic converter test'' , or a local muffler shop will do it for free.

I have a 2006 Dodge Grand Caravan. With 79,950 miles on it, the check engine light came on while on vacation. Took it into a shop and they charged about $100 to diagnose it as a P0420 bad Cat. Con. code. Drove through vacation week and then the light went off. I now have 82,000 miles on and the light came back on with same code. If I take it into a shop with original paperwork showing bad cat. conv. before 80,000 miles will this be covered under warranty?

if you bring in your paper work to the dealer they should honor their warranty.that being said they could also be a ..... & tell you its out of
warranty,at that point i'd contact the dealer rep.i'd also try to get your
100 bucks refunded

It's probably best to get a failed inspection report and file the claim yourself, a local muffler shop can do the install.

The dealership will probably take $150 for the install.

Yes it could be your cat but with the light going off and driving the amount you did I would look at how well the precat 02 sensor is working. I had the same problem on a windstar and watched the sensor and found it to be lazy, changed it and have not had a problem in over 5,000 miles.

A back stream HO2 sensor simulator could also resolve this problem.

I cannot imagine any dealer putting that through warranty willingly. You needed to have it in a dealership before 80K to get warranty coverage, plain and simple.