It could be a tricky one to nail this especially if the garage can not reproduce the fault. Try and give the garage as much information as possible as to when the fault occurs and how oftern it does it, ask to speak to the Master Tech directly about the fault.
It may be the EGR valve but it could be many other things aswell.
Hopefully the onboard diagnostics will have stored a code which should make fault tracing easier.
Keep us updated how you go on after it has been looked at.
|