Seat Leon diesel engine trouble

I have a Seat Leon as well, though I can't remember the exact year. I had a similar issue with the engine light and loss of power. If the reference value between the crankshaft and camshaft is off, it could very well be the crank sensor. Have you checked the timing belt? A misaligned timing belt can also cause misfires and throw off the reference value. Consider having the sensor checked for proper function. It's a relatively inexpensive part but crucial for engine operation.

Thanks for the quick reply! How did you figure out it was the crank sensor? Did you also have the misfire issue?

Yes, I had similar misfire issues as well. The engine was running very rough. I didn't want to risk damaging the engine further, so I took it to a workshop. They ran some diagnostics and confirmed it was a faulty crank sensor. If you're not comfortable diagnosing it yourself, I would recommend taking it to a professional. They can check the sensor and timing belt to ensure everything is within spec.

Thanks a lot for your help! I took it to the workshop, and you were right, the crank sensor was defective. It cost me 340€, but now it runs smoothly again!