Seat Inca knock sensor issue

That sounds suspiciously like what happened with my old Volvo. The check engine light popped on, and the car started behaving erratically – a bit like a washing machine on its last legs. It turned out to be a dodgy connection to a sensor as well. Have you checked the wiring and the plug that connects to the knock sensor? A visual inspection might reveal corrosion or damage. It's often the simplest things that cause the biggest headaches.

Interesting. You mentioned a 'dodgy connection'. Was it visibly damaged, or was it something more subtle? I've had a quick look, and the wiring seems okay at first glance, but I am no expert.

In my case, it wasn't obvious at all. The wire looked fine, but the connector was slightly corroded on the inside. It was enough to disrupt the signal. Given your symptoms and the potential cause you've identified, it's probably worth having a professional take a closer look. It could save you time and potential further damage. I ended up going to a workshop to get it sorted, and it was a relief to have it fixed properly.

Thanks for sharing your experience. I took it to a trusted mechanic, and you were spot on! It was indeed a faulty connection to the knock sensor. They cleaned the contacts and replaced the connector, and the warning light is now gone. Total cost was 95€, exactly what I was expecting. Appreciate the help!