They differ from brand to brand but the two most common are PCM: Powertrain Control Module ECM: Engine control module
There are hundreds of them. The most common are KYB, Moog, Raysbestos, Greddy and so on.
I don't really know what the most wanted car is in Spain , but I can share with you some information so you can find any car you want: www.directautoexport.com
Gm
No European brand is reliable, but the most reliable is Audi.
Seat in the spanish car brand with models like the Ibiza & Leon.
BMW
Honda
Ford and Chevrolet.
ford
Toyota
The Spanish brand of car was SEAT (and then there were some other brands of lorries). But some years ago SEAT was bought by Volkswagen, and now SEATs are still produced in Spain but not Spanish owned anymore. Apart from that, Spain is one of the biggest car makers in the world, with lots of foreign car brands producing here: Renault, Volkswagen, General Motors, etc. Spain today is the world's eighth largest producer of automobiles, Seat, VW, Nissan, Mercedes, Ford, Renault, Audi, Peugeot, Citroen, Opel and Iveco build cars/trucks in Spain.