The P4 is not like the P3 yaw arm grub screw. Yaw motor is self containedHave you checked yaw shaft alignment. There must be a set screw on the flat shaft of yaw motor.
i Do but not working , when i do in this position then its in center but when i do it in normal position its not in centerI had the same problem with the yaw position post fix. Tried this and it seem to fix the problem
Place you P4 in this position and then do the gimbal calibration
Here is the link to the original DJI article
Camera face towards left instead of facing center.