I would actually disagree with the above on the basis that VAG actually stands for Volkswagen Audi Group , With Seat being just one of its Subsidiaries ( aswell as Lamborghini , Skoda ect). I purchased an ELM Cable for use with other projects and was unsuccessful to connect it with my Golf GTI 1.8t or a friends Seat 1.8t both with 51 Plates on a variety of software. VAG-COM Software and the Cables, Unlike generic OBD-II/EOBD, uses manufacturer-specific commands, which allows the user to access all diagnostic capable vehicle systems. This was cleverly created by using reverse engineering (Ross tech would cause an error code and see what the Vag Cable Reported back to the PC) OBD-DIAG is the only non VAG tool i got working with my golf but with the Serial Version of the VAG Cable, the USB one would not connect. Nimikipod you are correct on the fact that your Ibiza Uses the Exact Same Engine, ECU ect as the GOLF, And i would be very surprised if you got an ELM Cable to Work .