Car key not working (C-class C180 Kompressor 2009)

[jamjakub]

This is my first post so please forgive any mistakes.
I have problem with one of my car keys. It stopped working. Not locking/unlocking a car, no ignition lights, no engine start.
Before it’s happened I noticed that key was plying e.g. not always locking or unlocking doors. I had to be close to the car or press and hold button on the key for a longer time in order to open doors.
Now it is dead, however the red light is flashing when pressing buttons. I have changed batteries and still nothing. Don’t recall dropping key or damage it in any way.
I have spare key which is working fine.
Do I need a new key or is there a way to repair it? When spoke with few locksmiths they all saying those keys are unrepairable and that I need a new one which cost over £200 from dealer.

Any ideas?

Mercedes C-class C180 Kompressor S204 2009

 

[whitenemesis]

Might be the coil has become detached.

Try these guys..

How much is a Mercedes Key? - Replacementmercedeskeys.co.uk

 

[jamjakub]

I did already.
£120 for repair
£200 for a new key (almost the same as dealer)

How difficult is to replace coil?
After replacing coil do you need to reprogrammed the key?

 

[bob6600]

If it is similar to the older plastic keys then it's not difficult if you can solder.

No programming required

 

[jamjakub]

Thanks for info and advice.

I might do it myself.