Hi cute little car has a problem. The keys will no longer operate the central locking, leaving us in the position of not being able to lock the car unless were in it with the engine running. The locking became a bit hit and miss recently but with a few presses would eventually lock. It stopped working so I changed the batteries in both keys and still nothing. The old batteries showed 3v, the new ones 3.3v. The fuse is fine when tester put across it and the horn works also. If I start the car I can lock the doors from the dashboard. I cant find where the signal sensor for the central locking is using google. Has anyone else had this problem?