Seat Tarraco Hybrid Engine Issues

I also drive a Seat Tarraco, though I have the petrol version. I recall someone mentioning a similar problem on another forum, and it was indeed related to the manifold pressure sensor. Have you checked for any obvious vacuum leaks around the intake manifold? Sometimes a loose hose can trigger these symptoms. It might be worth inspecting before assuming sensor failure.

Thanks, that's helpful. I haven't checked for vacuum leaks myself, as I don't have much experience with car repairs. Where exactly should I be looking for these leaks around the intake manifold? Is it something I can easily see or feel?

While I can't be entirely certain without a proper diagnosis, the symptoms you describe do align with a potential manifold pressure sensor issue caused by a vacuum leak. A significant leak would affect the sensor readings, leading to the problems you're experiencing. Given your lack of experience, it might be best to take it to a qualified mechanic for inspection. They can perform a smoke test to pinpoint any leaks and properly diagnose the sensor. This way you prevent further damage.

Thanks for the advice. I took it to the workshop and they confirmed it was the manifold pressure sensor. Replaced it and now everything seems to be running smoothly. Cost me 235€.