As previously mentioned in another post I have successfully added a replacement key to my 2013 L405. I checked on line and couldn't find a clear process for coding a new key to the pre 2016 models.

It involves a little work with the GAP IID BT tool but relatively easy and worth the effort, I was quoted approximately £160 to £240 for a replacement key and managed to get one for £15 on line.

Please remember that this is entirely at your own risk, this is just the process I followed and it worked for me so I cant guarantee that it will be the same for everyone.

1, The very first thing you must do is update your IID tool with the tool updater using the GAP installer, most people will still have this on their desktop, if not it can be downloaded from the Gap website. When the installing has found your tool you click on Programme Firmware.

2 After downloading the latest version release version 4138 plug the tool into the car, you will probably see a red message at the top of the screen advising to update tool info, click on this and then follow the next steps.



3, With the tool in the OBD port follow these instructions :
Menu--ECU Flash--KVM Keyless OR RFA-Keyless ( you will flash the ECU info at this stage )
Menu--ECU info, you must now send the info to GAP ( the page you are on )by clicking on the email button bottom left hand corner, they can only send you the programme flash if you email this page to them and dont screenshot it. Please let them know that you are key coding and want to programme a new key to your car.

4, You will receive an email back from gap to download the file required, at this stage reconnect the tool to your desktop tool updater and update the tool again ( even though you have just already done this you need to do it a second time, once the update has finished now click on Program flash files button only, this will now download to the tool the files to programme your keys(s)

5, You now need to plug the tool back into the car and hit the update tool button again, now you are ready to programme the new key !

Menu--ECU Flash--Keyless Add Key OR RFA-Keyless, just follow the on screen prompts now and make sure you have the new key with you ready to press the required buttons. ( I also kept the 1 already programmed key I have inside the car ).

It may seem long winded but you just follow the simple steps and I would make sure you check the time in Quebec where GAP are based, you want them to be at work when they receive your emails so you get a quicker response. I have to say they were amazing and wrote straight back within minutes !

Happy key coding.

Great write up. Thanks.