I have a 2014 and have had the exhaust problem repaired. It was a headache when the CEL went on as we are full timers. At first found a dealer in NC replaced sensor in DEF tank. Fifty miles down the road the light came back on. The real issue is what would be a diesel catalytic converter. Stopped a dealer in Indiana who replaced it under warranty end of problem. The TPMS are the tire monitors. They were replaced. They are not critical didn't have the before I bought my longhorn. My bracket was checked and found to be ok. The others were flashes that were done when I took the truck in for the free oil changes. The truck is a beast towing. My third Ram diesel never had a reason to buy a different brand.