2021 NEWMAR DUTCH STAR Engine Problems

I recently purchased a 2021 Newmar Dutchstar Motorhome, and took delivery recently. The Diesel Exhaust Fluid (DEF) sensor failed in less than 3,000 miles. As a newbie in the motorhome world, I was stunned and very disappointed that this failure occurred so quickly, and also with the ramifications of the failure. When DEF sensors fail the engine can go into derate state which can cause my coach to move at a maximum of 5 mph in less than a couple hundred miles, and then the engine SHUTS DOWN. I contacted Spartan motors, the manufacturer of my chassis, and was told that this is a known problem with diesel engines, and that there is a worldwide problem with the DEF failures compounded by a worldwide shortage in functioning replacement parts. The DEF sensors regulation was passed by EPA in 2016, stating the DEF concentration be measured in the DEF tanks of...