MKL and power loss in the Seat Leon (2015) - possible combustion misfires

Hi, I'm not an automotive mechatronics engineer, but I do have some experience as I own a 2013 Seat Ibiza myself. I encountered a similar problem. It turned out that the engine control unit was faulty. I had it repaired at my garage and it cost me around 1000 euros. Of course, it could be that your problem is something else, as not all cars are identical. Can you perhaps tell us a bit more about the symptoms? It would be helpful if you could tell us, for example, how often these failures occur and under what conditions it happens. The more details you can give, the better I may be able to help. I would recommend that you have the vehicle checked by a specialist. Then you'll have a better idea of what's going on.

(Translated from German)

Thanks for your feedback! The failures happen quite unpredictably, but they occur more frequently when I've driven longer distances. I had the last service at 72655 km, since then I've added about 1000 km. I will definitely follow your advice and have the car checked at the garage to find out more precisely what the problem is and how to solve it. I hope it's nothing too serious.

(Translated from German)

Hey, no problem! So, if the failures occur after longer trips, several things could be the cause. Overheating or a malfunction in the cooling system could exacerbate the problem. But it could also be due to a faulty ignition coil system causing misfiring, as you suspected. When I had a similar problem with my Seat Ibiza, the ignition coil system was defective. This had to be replaced, which wasn't cheap either, but since then the car has been running perfectly again. Just to emphasize, you really should consult a specialist. Only they can determine the exact cause of your symptoms. Of course, I can only speak from my own experience, which is not universal. Good luck, hopefully it's not too much of a repair! In any case, let us know how it turns out.

(Translated from German)

Hey, thanks for the advice! I'll definitely have the ignition coils checked, and I'll also keep in mind the possible overheating and malfunction in the cooling system. I really hope it won't be too expensive. But the main thing, of course, is that my Seat will run smoothly again. I'll keep you up to date as soon as I have news from the mechanic. Thanks again and see you soon!

(Translated from German)