Try to leave the key in the ignition for at leas 15 min if nothing happen just take it to mechanic with good scan tools or to the dealer
thank you
SOURCE: c240 mercedes key wont turn seems locked
I have a 2001 C240 with the same issue. I removed the positive battery cable from the battery and kept it off for 30 seconds then replaced it. Everything was reset and the key worked.
SOURCE: key fob will not undo
If you don't have one that works for the vehicle now, you'll have to take it to your local dealer to have it programmed to the vehicle. Some will charge for this, some will do it at no charge.
If you do have a remote that is programmed and working for the vehicle, then the following steps will allow you to program another remote:
1. Enter vehicle and close all doors.
2. Put seatbelt on (or clip it into the buckle) to shut the warning buzzer off.
3. Put key in ignition, turn to run position but don't start it.
4. Press and hold the unlock button on the working key fob and hold for 4 seconds, then also press the panic button.
5. Release both buttons and you should hear a single chime to indicate it is in program mode. You have 30 seconds after the chime to program any additional remotes you want to program.
6. Press and release both the unlock and lock buttons simultaneously on the remote you are programming. You should hear another single chime.
7. Within 4 seconds after hearing the chime, press either lock or unlock button on remote that you are programming.
SOURCE: renault megane key fob wont work
I had the same problem with mine
your key fob is now out of sync with the ECU to sync them just follow this link (renault will charge up to £180 for new key and to sync it)
http://renaulthelp.110mb.com/ImmBypass.html
SOURCE: My Porsche Cayenne S Key fob no longer unlocks the Door
unlock the door then press the lock button on remote and hold down for 20/30 secs.manual does say hold button.....
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