Hi, my name is ***** ***** I will be happy to assist with this today.In some cases, I may need more info to assist better.I apologize for any delay.
I try to be here most weekdays and some weekends.If you respond and I do not respond back right away I will do so as soon as I can.
Unfortunately, your remote door locking will not work and it is possible the engine may not even start if the key is not recognized by your vehicles computers to be compatible.It has to be a specific key coded to your vehicles VIN number in order for it to work in your model.Usually, the key has to come from a dealer pre-programmed to your VIN as Mercedes is regulated heavily on using any used keys to start the engine as well as allow locking and unlocking.They cannot be reprogrammed to a different vehicle like yours here.
The best thing to do is if you need a new key and ignition is these would need to be replaced new, coded/programmed to your vehicle to operate properly in it to allow starting and locking/unlocking features.
You can try a used one but I am almost positive it won't work.
If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service, your 5-star rating is appreciated ( should be a link to click on here or above).You can rate at any time and we can continue to work on your question as this will not close out your question.I work on delivering the best answer and help here but in some cases, it can be difficult to do without seeing the vehicle.