Tim;
Thanks for reading my blog. Let me try with some responses to your questions. I’m not sure what heat sensor you are referencing. I think there are exhaust heat sensors and air intake heat sensors, but I have not experience with any of them. But I have been told by a MB tech that biodiesel does burn hotter. If it was an exhaust temp sensor and a dirty DPF that sounds like you got a bad batch of biodiesel. Usually a MB tech can test your fuel to see if it is biodiesel (I’ve had mine tested a couple time when I had CEL issues). In my travels in the US, I see about 50-75% of the pumps labeled. I know that all the big truck stops use biodiesel so I avoid them. If a pump says 5-20% or is labeled B15 or B20 then I go elsewhere. Also, if the diesel pump nozzle is caked with grease I go elsewhere for fuel. Biodiesel is essentially regular diesel fuel mixed with used vegetable oil. I’ve had good luck using big name brand fuel places near highways. I do not use any fuel treatments and have been told to stay away from them by a MB tech. If you use a treatment and it causes a problem with temperature or clogs an injector then it voids the warranty. On a scanner, the Sprinter will put out standard OBD II codes but they are not always accurate. The MB engines puts out their own more detailed codes and only the MB tech can read them. I carry an inexpensive OBD II reader but it will just give you a general idea and not the real codes that the MB tech will use.
Overall, I’ve been pleased with the Sprinter. But, you do have to be vigilant with the fuel. I learned that lesson during my first 12,000 miles with several CEL issues.
J. Dawg