Did the dealer update software for the engine? My fr9060 was fine until the software update, then I started to get the same code. There is no exhaust gas sensor on the engine, the computer uses different parameters from other sensors to determine what it "thinks" the temp is. I replaced the exhaust manifold which was cracked along with a new turbo, machined the manifold and turbo to fit together without a gasket between them ( this gasket was also blown out), all this was done by recomendation from New Holland ( they paid for it). Then they told me to straight pipe it to lessen back pressure on the turbo and exhaust temperature. It may have helped a little but is definitely not a 100% fix, it still derateswhen running above 115% engine load on a warm day. This is a very annoying problem, they tell me that they have software to widen the parameters for derates but the EPA WONT LET THEM INSTALL IT because they are messing with emissions. I said put the old software back in, no can do, they changed it because owners were putting power chips in and eating turbos.