Well, yes, but its no guarantee that its going to fix it, just an educated guess, for example - You could have 2 faulty keys, but this is unlikely, but not impossible.So you would recommend changing com2000?
The option of some diagnostics could make the diagnosis more positive to which bit needs changing and I will look into this for you.
(I looked on my lexia and for a facelift model car it does show an option to talk to the 'High Frequency Transmitter' which I would think is the remote central locking. This is good news as there may be some information about signal strength or interference that could diagnose the fault better). I will see if I can get more information during the daylight hours.
Changing the com2000 is a bit involved. You need to remove the air bag to get the steering wheel off, then you can get the com2000 off. You must disconnect the battery and leave it for at least 30 minutes before removing the air bag. Put the air bag somewhere safe (not in the car), safe as in, if it goes off accidentally then no one is going to get hurt.
some tips for disconnecting and reconnecting the battery safely
Battery Changing Procedure:
Open the drivers window and the bonnet.
Close all the doors, switch off everything, like the radio, phone charger etc.
Remove the ignition key via the open window
WAIT 10 minutes
Disconnect the battery.
(do the job that needs the battery disconnected)
Reconnect the battery,
WAIT 1 minute
Keeping the doors closed, lean in via the drives window
Switch on lights
Then switch on 'ignition' and start the car.
Check the electric windows don't need resetting, the radio reprogramming etc.
There is no mention of having to get the com2000 coded to the car, luckily.