I've recently had the amber coil warning light for emmissions come on my car with the car going into limp mode and the engine management light on too. I had a friend plug in his diagnosis error reader, and it came up with an error with the EGR valve. I was advised it's a costly fix into £100s I've been told though by other people it is easy enough to take of a clean. Which I have attempted but I think I have cleaned the EGR antI shudder valve, circled in the attached photo. Can someone please point out to me where the egr valve is situated in my engine bay. And as much advice as possible to carry out this task.