Take it to an exhaust shop, and have them do a pressure test on the exhaust. Should tell you if your cat is going bad.

 

I just called a local shop. They said it would take a couple hours.. Ha. I'm just going to find or rent a tool myself to check through the front o2.

 

Most of which would be spent sitting on your hands, waiting for them to get it inside.

When I was doing this for a living, it took us longer to get the vehicle on the hoist, and up in the air, than it did to do the actual test.....

 

Just wanted to follow up since I finally fixed my problem this past weekend and hardly anyone follows up with this particular problem. It was the front o2 sensor. I started with a Bosch(given to my by dealership when I bought the truck), tried a Denso with no fix.. Started replacing other things. Finally went back and replaced the front o2 sensor with an actual oem Mopar sensor. P0132 and P0138 went away and never came back. The truck is driving better than it ever has and the check engine light is gone.

 

awesome..that was cheaper than my problem.