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I don't know anything about consumer laws in Denmark but in the UK I would ask the garage to write a statement that states the failed item and the cause of its failure. Then include this in a written communication to the head of Mitsubishi in Denmark and state that:

The part that failed is a major component that is expected to last the life of the vehicle, beyond the 100,000km standard warranty. The failed component is not influenced by how the car is driven as it is controlled by the car and not the driver. The car has been maintained in accordance with Mitsubishi recommendations and services were performed by Mitsubishi dealers so it therefore was not of "merchantable quality" when first supplied. Then request that Mitsubishi correct this problem and pay for the parts and labour.

They might then offer to at least pay for some of it. Again, in the UK if they did not respond positively I would say that:

This is not acceptable and that I will refer them to the Ombudsman unless they change their approach.

This approach does seem over the top but you have nothing to lose except for some time in writing to them. I wish you good luck with your car.