Focus knock sensor symptoms

Sounds like it could be the knock sensor. Is the car's performance noticeably poor, like hesitation during acceleration, especially under load? Could also be ignition timing issues as a result of the faulty signal.

Yes, I've noticed some hesitation. So, the bad cable or connector on the knock sensor could be causing all these problems, including the malfunction indicator?

Yes, a faulty connection can definitely cause all those issues. A loose or corroded connection can interrupt the signal from the knock sensor, leading to inaccurate readings and the problems you describe. It's probably best to get it checked at a workshop.

Thanks, I appreciate the confirmation. Took it to the workshop; the cable was indeed faulty. They replaced it. Total cost was 95€. Everything is running smoothly again.