I have a 02 S60 and when i use the remote to lock the doors, all of the doors will lock, but the passenger door will lock then immediately unlock. I have to try locking it many times before it will finally stay locked. Any ideas? Thanks!

 

i have same issue with 03 2.4t, im thinking its the actuator, just a guess though

 

I also have an '02 s60 that had a problem with the left rear door not locking/locking and then unlocking when using the fob. Gave it a shot of silicone spray lubricant and haven't had a problem since.

 

I had the same problem and then it magically fixed itself. Go figure.