3.8L 2002 Ford mustang fix P1633 code how?

Question

How to fix P1633 took it for smog catalyst sensores exhausta ect al pass except p1633 malfunction code not passing any ideas my guess get a new pcm computer for car or fuse box batterry is good

Answer 1

P1633 Keep Alive Power

You can try to disconnect the battery , then disconnect the ECM, a build up of corrosion at the ECM are usually problem when dealing with this code rather than the ECM