Does the locks on the other doors work still? If so you know it's just the one door that's playing up. If that's the case, you might need to undo the door trims and see if the door locking solenoid is broken or if it's stuck. If it is stuck or fallen out, you can fix it on the spot, If it is broken, you can remove it, which will mean that your door will not lock automatically. I've replaced central locking with an aftermarket kit that cost $30. Removing the older one. But if your looking into getting this fixed at Renault, I'd start crying now so when they'll tell you the price, you'll have no tears to shed.
Kari, March 2008