I have had this fault code come up for a while now, and searching the archives it appears I am not the only one. It has been raised before, but in a thread whose main topic is warranty claims:
http://www.fullfatrr.com/forum/post486036.html#486036

So to give this some proper exposure, does anyone have a definitive answer on whether this fault can be safely ignored? There are clearly different variations on EGR Temp Sensors faults, some more serious than others. Some warn that this can lead to overfuelling and the DPF filling up. I have had only one instance of the DPF requiring regeneration, and that was a year ago. I have just done 500 mile round trip where the car performed perfectly and returned 33 mpg, so I don't think it is overfuelling.

So what do we think? Ignore it?

Click image to enlarge

Have a read of this thread, particularly from page 4.
http://www.fullfatrr.com/forum/topic48131-45.html

My view is to leave it alone, mine has had this code since I bought it, I’ve done 40K miles and never had a DPF issue so is it linked?
Mine has had the turbo drain mod done so has this had an effect on the DPF?
It seems to me that there are so many variables associated with DPF problems (with all diesels) that it is almost impossible to pin it down to a sensor.
After saying all this I would probably think completely differently if I was having a problem

Many thanks. I had missed the other thread. I think I will leave well alone unless I start getting problems. 2011 Vogue TDV8 4.4
1992 Mazda Mx5

Found this in the workshop manual: