L322 2003. seems my key fob suddenly stopped unlocking my doors. I replaced the battery, but didn't olve my problem.
The fob light comes on when I press the buttons on the fob. it will unlock the door using the key and will start the vehicle. I did a google on how to sych the key but no luck.
One method said unlock car have doors closed and insert key to ignition turn to pos 1 then back to 0, remove key , press unlock and hold and press lock button 3 times within a certain time no luck, another instruction said same but have vehicle locked when doing the procedure. ,no luck either.

Any ideas?I have another fob that works which I am now using.

I have a similar issue I now have one that does everything one that opens doors and starts but no fob and one key that just opens the doors - I have tried local specialist has tried all that happens is the the keys change operation but only one will work on the fob at any time Good luck hope yours is an easier fix

When you synch the second key you must not put it in the ignition as that starts the cycle over again. Apologies if you were aware.  John
2008 Stornoway Grey 3.6 Tdv8 Vogue
2005 TD6 Java Black Vogue - Written off!!
GAP iiD BT
2003 Discovery TD5 Auto, Nanocom Evolution - gone to a new home!
MasseyFerguson 152 - No electronics!! - Sold

Keep trying, took me several goes to get it to work:

http://www.fullfatrr.com/forum/post479032.html#479032 .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

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Weegie wrote:

When you synch the second key you must not put it in the ignition as that starts the cycle over again. Apologies if you were aware.

Update: I managed to get the working key into sych mode with the procedures listed but the second key will not sych.