There is a vid on youtube for removal of fiat EGR valve.
It's in French but it shows what to watch for and also where the gaskets are - don't drop those!
remove engine cover, remove negative terminal to battery. undo electrical connection to EGR by flicking yellow clip down and remove multiplug, take bolts out on the pipe bracket across the top, remove bracket and keep nuts safe to one side. undo 2 13mm bolts on top of EGR and DO NOT let the exhaust bracket underneath go until you have the gasket safe in your hand. Then undo the other four bolts and EGR slips off - have a look inside the chamber - probably very sooty - leave it to soak in carb cleaner for a good while. Clean up and dry off - reattach and then do the "ECU reset miracle cure" (see separate thread) and see how that works.