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Interesting vehicle! Unfortunately, I think your controller is probably not compatible with an iPhone 4S. It might be a bit tricky to find which part you need. I would suggest trying Skoda enthusiast sites, there has to be someone who has found a solution for this issue. One problem with finding out what you need is that Skoda isn't sold in much of the world, including the States as far as I know, so your resources may be rather limited.