help egr valve

Hi can anyone help, my 2.2 diesel is showing an engine management light which the mechanic says is the EGR Valve we have cleaned it that only works for about 20 miles before coming on again, then we replaced it with a second hand one this has also done the same thing, a new one has been quoted at £300 plus fitting plus vat, before I even think of doing that is there anything we are missing ? I want to really keep the car on the road as it is a great car but haven't got endless pockets
 
So you've cleaned the EGR valve and also tried a different one.

Have you verified that the EGR-related electronics are in working order, and the pipes/hoses are clean/not clogged?

Which fault code is it?
 
So you've cleaned the EGR valve and also tried a different one.

Have you verified that the EGR-related electronics are in working order, and the pipes/hoses are clean/not clogged?

Which fault code is it?
thanks for your response I will check with the mechanic re the code and the pipes/hoses and let you know, cheers
 
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