2003 XC. About six months ago the passenger door unlocks itself immediately
after using the key fob to lock the car. All other door locks function properly.
When you open the drivers door and press the fob to lock the doors, reach across and manually lock the passenger door, then exi,t the passenger door stays locked.

All doors unlock correctly.

I used the key to manually lock the car several times and the passenger door locked worked correctly for a few cycles and then failed to lock again.
Thx.
Art