Newbie looking for help with newly purchased A4 B8 2008. When I lock the doors with the remote fob (1 click only) the drivers door doesn't always unlock. When I lock the doors (2 clicks) it does seem to unlock. It always unlocks on the key however.

The cars been standing a while as it was a bereavement car so hoping the can of wd40 I squirted in the lock this morning will sort it. But if not what's the general consensus? Actuator?