grahamjf Posted September 2, 2016 Report Share Posted September 2, 2016 Hi allI took my car to audi to get a diagnostic check done came back as egr valve insufficient flow.Bought a new siemens EGR valve and I am Still getting the same fault codeThe pipe feeding the egr valve has slight oily/sooty coating on the inside which can be wiped off with your finger. No blockages in the pipe.What else could cause this fault?2005 Audi A4 2.0Tdi Link to comment Share on other sites More sharing options...
cruiser647 Posted September 5, 2016 Report Share Posted September 5, 2016 I usually use a VERY liberal spraying of carb cleaner all through the pipes as far as I can reach on all the lines connected to the EGR. Let it dry and then try it. Link to comment Share on other sites More sharing options...
grahamjf Posted September 5, 2016 Author Report Share Posted September 5, 2016 Thanks for the reply I'll give it a shot Link to comment Share on other sites More sharing options...
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