Knock sensor code PO 0236
 

I have a 1995 850 GLT sedan 2.4L 5cyl sedan with 134,445 miles just set o code PO 0236 bank one knock sensor code. Engine starts and runs great but the check engine light is on.
I have reset the code a couple of times, it comes back on after about five minutes of driving.
Does the knock sensor performance could be a Mormon problem? no engine knocking is noted.
Any input is greatly appreciated.