The EGR ECU/Brain would under go a number of electronic tests. Any items that fail would be replaced the EGR VALVE then would be reassembled and tamper proof marks would be applied.
A full functional test would also be carried out before being dispatched to you. (Please look at my feedback). Thank you for looking and if you have any questions please do not hesitate to ask. (You will receive 1 complete EGR valve as seen in add pictures).
PLEASE MAKESURE BEFORE ORDERING THAT THIS IS THE CORRECT UNIT / FITMENT FOR YOUR VEHICLE!