360 knock sensor

Scan with Launch 431 showed 2 knock sensors as “ not equipped “ . I replaced all 4 ( did heat exchanger while there too) . So now I have one sensor showing as “not equipped “
I’m ran a data steam on the sensor with the car off and running . All four sensors are putting out data and all 4 read exactly the same.
I can’t figure our why one sensor Is showing “not equipped “ on a diagnostic scan yet shows up on the data steam output as normal, I.e. all 4 have the same data output.
Any ideas ?
( I did have Maze do an ECU reflash but I can’t correlate if it effected reading the knock sensors)
Maybe I’ll call him too .

 

Thanks. That was one of my suspicions . That’s a big help !