The way to check it would be to connect a dealer level scan tool up, one that can see live sensor outputs and check that it is operating in the correct range. The pressure sensor can also get clogged up with soot.I spoke with ZZ Diesel in Kokomo IN. He suggested the DPF pressure sensor might be bad. I’m going to research how to check that before I buy one.
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But, the ecm should be seeing the sensor output, and should throw a code if it's not operating correctly.
Possibly you could use the alfa-obd, but I don't know if it sees live sensor data.