2002 Kia Rio with Manual locks My passenger side door won't lock/unlock; with/without key, or even open at all. And I haven't ever been able to lock/unlock, that door with the key but the door was opening just fine, like, a month ago. What do you you think the issue might be?? And how do I fix it??

remove the door panel and check the wiring to the locking circuit and the rod linkage is intact

Key turning in the lock does not necessarily indicate it is working. You will have to remove the inside panel to get access to these parts. There are different ways in which a key lbock serves to prevent the latch from working. Most likely, the key operates a rod to the latch (if the key socket is seperate from the latch. If the key socket is within the handle, then probably you will have to drill out the key hole from the outside that should free up the latch. Then you will have to get a replacement latch and key section. Most of this becomes evident by observing the mechanism from the inside of the car. Depending on how tight the passenger seat is relative to the door panel, you may have to remove the seat. Even if you send up going to a locksmith, removing the inside parts will speed up his operation and save money.

put fuse back in disconnect batt wait 60 seconds re attach, when the horn starts honking lock and unlock drivers door with the key while doors closed window down. get in car and start it, should be fine now.

you got to turn the key to unlock and lock twice in the same direction

door in passenger side will not open in the front

Disconnect and then reconnect your battery will sometimes work...it might be worth a try.

Hello,
Just had the same problem and know it is fixed.
You may have worked out that you can use the fob to unlock and then immediately lift the passenger handle to get access- not ideal.
In my case I couldn't turn the key in the drivers door either
1, Remove the 25 AMP fuse for door locking from fuse box under the bonnet. This disables central locking. The passenger door opens fine. The key however won't turn in drivers door.
2, Spray WD40 or other moisture repellent protective lubricant on key. Insert into drivers lock- gently turn back and forth. Half remove key so you can spray more WD40 into lock- a good blast will do. Keep gently turning until you can lock and unlock.
3, Replace 25 amp fuse
4, Hopefully job done- worked for me

Hello,
1, Use fob to unlock and immediately open passenger door. This will give you access to bonnet release switch.
2, Open bonnet and remove 25AMP Door lock fuse
3, Spray WD40 on key- place in drivers door lock and gently try to open and close- do not use force. Half remove key and spray more WD40 into barrell. Keep gently playing until you can lock and unlock using key
4, Replace 25AMP fuse
5, It worked for me- hopefully for you also

I think central locking is a system so if it doesnt work try seeing if it can be replaced, or completely taken out and revert to manual unlocking.

Hello, we have a 2003 Kia Rio- problem as above- unlocking and then locking- only way in and out through passenger door.
This is what I have done and everything is back to normal- I hope it works for you.
1 Remove 25AMP fuse that controls door central locking from main box under the bonnet.
(AT this stage my passenger door opens- drivers side does not, the mechanism won't fully rotate)
2, Spray key with WD40 (or similar moisture repellent lubricant). Gently turn key to loosen mechanism- Partly remove key and spray lubricant into lock, have fun locking and unlocking!
3, Replace 25 amp fuse
4, Write yourself a cheque for garage labour and parts and wife brownie points!