When you arrive at the car park, to enter, take your ticket
Wait at the barrier, the AENA staff will open it for you so you can leave your car right in front of the airport.
If you have landed at Terminal 1; make your way to level -1 of the Parking VIP. You just have to go down the escalator from Arrivals and, once you are down, cross at the pedestrian crossing. The VIP car park is a few metres further on, to the left. If you have landed at Terminal 2; make your way to the same place you left your car and an AENA staff member will be waiting to return it to you.
Aeropuerto Barcelona - El Prat (Terminal 1 - Salidas)
Aeropuerto Barcelona - El Prat (Terminal 2-B)