C240 mercedes key wont turn seems locked... I went to my car used fob doors unlocked when I tried starting i inserted the key in the ignition and the fob will not turn seems locked..now all of a sudden the key fob will not lock my doors

google how to program fob for 2011 chevy malibu for more info

On the Chevy key fob, press and hold the "Unlock" and "Lock" buttons at the same time until you hear the door lock and unlock again. This means you're all set. Re-insert the programmed key back into the ignition to the "On" position to finish the Chevy key fob programming process

1. Close all the doors and insert the key into the ignition.
2. Turn the key off then on repeatedly until the door locks cycle. End with the key turned on.
3. Press the lock or unlock button on the key fob. If the doors lock (or unlock), the key fob is programmed.
4. Turn the ignition to off

TRY A NEW BATT IN THE KEY FOB.

TRY A NEW BATT IN THE KEY FOB!

Try checking the key reader it's usually a plastic ring around the key barrel. If it's dies will not read code in key to enable the car to start. Check your key is sending a code as well.

Take the key apart, replace the battery. The car needs to relearn the key, so stick it in the ignition, turn the car to the "on" setting without starting, press the unlock button on the fob. Thats it!

1. Some times the keys wear out. Do you have a spair key you can try.
2. Turn the steering wheel back and forth while trying to turn the key sometime the steering wheering lock will bind.
3. Now the bummer part is the ignition lock will have to come out so you can determine what part froze up.

If key will not turn
Car battery flat,charge or jump to activate elec ignition

You should not have to reset the key fob after a battery replacement. The signal from the key fob stays the same and is programed to the reciever.
If the key fob needs to be reprogrammed then follow these steps.
1. Have all key fobs with you during programming.
2. Sit in the vehicle with all doors closed.
3. Lock all doors using the Lock/Unlock switch on the door.
4. Insert and withdraw the ignition key 7 to 9 times within 10 seconds (do not turn the key, just insert and withdraw).
5. The 4 way flasher indicator on the dash should flash once or twice.
6. Insert the ignition key and turn it on (key on, engine off).
7. Press any button on one remote and the 4 way flasher indicator on the dash should flash once.
8. If you have more key fobs to program use the Lock/Unlock button on the door to unlock the doors and then lock the doors.
9. Press any button on the next key fob and the 4 way flasher indicator on the dash should flash once.
10. Repeat if you have more key fobs. Only 5 can be programmed.
11. To exit, simply turn of the igniton and remove the ignition key.
12. Unlock the doors using the Lock/Unlock switch on the door and exit the vehicle.
13. Make sure the window is down when testing remotes in case you leave the keys inside.
14. Close all doors and test all remotes that were programmed.

Do not skip any steps or the process will not work.

If the 4 way flasher indicator does not work when inserting the key, you will need to start the process from the begining. If it still does not work the receiver may be your problem.

If the 4 way flasher indicator does not flash when pressing any button on the key fob then the key fob is the problem (dead battery or defective remote)

I have an A4 and did this to re-program my key:

1. used the key to start the car...then turned it off
2. put the key in the driver door (door closed)
3. pressed the lock button on the key fob once
4. turned the key to lock the door.

This is basically the steps in the owners manual, but the car must be started with the key first, and the key must be in the door lock before pressing the lock button.