Mine showed reduced fuel economy dropping from 40's to 33mpg. Hidden menu showed it was barely reaching 55 degrees home to work and 65 degrees work to home (35 minute journey mainly motorway). Replaced egr thermostat - shot up to 77 degrees. Two weeks later (delay due to bad weather) replaced main thermostat. Never got above 80 degrees except when regen.
Now stays around 65 degrees some 6 weeks later - lesson? dont buy these parts from eurocarparts. Got a BMW egr thermostat on its way I will update with the results. Will probably have to go through the changing the main stat also......
I know the temp sender range is working (ie is not faulty) because it does reach the magic 90 degrees when doing a regen. So I am aiming to replace parts until I achieve the quoted 90 degrees. As above the DPF is the main worry...
