Try this
Fixed service Interval
Seat Exeo Fixed service Interval Service Light Reset
Switch ignition OFF.
Press and hold button "1" and then switch ignition ON.
The words "SERVICE IN ----- Km/Miles" or "SERVICE!" will appear in the display "D".
Release button "1" and immediately press and hold button "2". The words "SERVICE IN ----- Km/Miles --- days" or "SERVICE!" will appear in the display "D".
Switch ignition OFF to complete the service interval indicator reset.
Longlife service interval
Longlife service interval is not possible to set without suitable diagnostic equipment.
read more at:
http://www.servicelightreset.com/Seat-Exeo-model-how-to-reset-service-light
Run VCDS SRI reset, select reset option from dropdown menu, done