Hi I'm new to the fiat forum and wondered if any of you could help
I own a fiat stilo 1.6 16v active sport
my remote Central has never worked and I have been using the key manually

But I've just gone to lock my car and only the drivers door is locking, the passenger side door and the boot are remaining unlocked
If anyone has advice it'd be much appreciated

What happens if you lock it from the passenger side?

I'd release and the reconnect the Door to 'A' pillar wiring plug as this'll sometimes get a minor loose connection in it and cause issues like this.

Have you tried replacing the key fob battery? With a good quality one mind