1. Switch engine off & remove keys 2. Lift up seat unit 3. Cut around the "do not remove sticker" where the round lump is 4. Prise out round bung that you just cut round 5. Identify fuel chip in the socket and note which way round it goes (should be a "notch" in one end) 6. Remove chip carefully and level to avoid bending pins 7. Insert new chip carefully ensuring all chip legs locate into socket 8. Push chip firmly home into socket 9. Replace bung 10. Put new sticker on top 11. Put seat unit down 12. Take keys out of pocket and test!