Lexus UX knock sensor issue

Sounds familiar. Had similar symptoms on my old Opel Astra. The warning light was on and the engine performance was degraded. Have you checked the sensor's cable and plug?

Yeah, I checked, but couldn't spot anything obvious. What was the cause in your case?

In my case, it was also a defective cable connection that caused the issue. I'd recommend a workshop to properly diagnose the problem.

Thanks. It ended up being a faulty knock sensor connection, just like you said. Cost 95€ to fix.