Central locking - a new slant
I had the familiar central locking problem last year (passenger door didn't always respond) so I followed advice and disconnected the 2 wire lead so the door no longer signals the central locking if it doesn't lock.
Since then, the lock has occasionally locked and unlocked with the central locking but usually doesn't and I control it manually.
While rebuilding the suspension, I took out the rear parcel shelf and disconnected the sensor wiring. Since re-ftting it all, the passenger door now always lock and unlocks - conicidence?