95 850 Turbo knock sensor code keeps reoccuring

[2012]

Hi,
On my 850 Turbo with 138000 miles, I keep getting engine code 143, knock sensor signal. every couple of days it comes back on especially under hard acceleration. Is it misfiring? Dirty ignition system or bad wires? Or are these knock sensors actually failing?

THanks for any advice.

[whilst]

Check your boost > too high?
Try higher octane.