This temp sensor is open circuit, Autodata only shows 2 sensors!

There are 3 on the dpf, the logical way to expose the culprit would be to look at live data however only 2 listed also launch only shows 2 in live data.

I can unplug 2 & live data does react how ever that dose not give me any confidence to "guess" on the other sensor
has anyone had this issue

Thanks in advance