After having my car numerous times to the garage who eventually concluded the EGR valve had failed after 12yrs service and no option but to replace. Purchased an the EGR valve from UK Diesel Parts Ltd and car ran not 100%, so contacted them and they promptly responded by sending me out an additional EGR valve to see if this would solve the problem, which did. All parts can fail no matter of make/quality, even OEM parts. In my opinion, I strive on customer service and this company meets can deliver products and solve any issues if the need should arise. Thankyou for solving our problem.! KR Paul