Where can i get an egr valve for 1997 aston martin db7

You can try to your local auto parts delar shops for the part or search your needed aston martin part online.

All engine parts for the 6 cyl are Jaguar 3.2 parts, so any XJ6 or XJS parts. Not to mention the fact that they are 10% of the price! Ditto suspension parts. If anyone tells you otherwise, ignore them. I worked on that engine for many years.