hi Martin,it is very easy to change,fits at the side of the battery cover,2 hoses and one screw and 1 connector,and not too dear.
changed many of these,but it normally logs a code ! and usually you have to switch of the engine to reset back out of limp home mode.
another possibility is a intermitant faulty/sticking EGR valve.
faults like this are horrible to diagnose for a technician if its only every 900 miles,and very frustrating for you.
it might be worth asking who you bought it off if they had any problems and if anything has been replaced.but i guess they will say it was ok.
regards GH.
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