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Discussion Starter · #1 ·
Got my Smart Car from a used dealership. There was only one key.

The key worked great for everything (never tried using it to manually unlock the door before this though) for months.

Keyfob stopped working out of nowhere, no buttons working. We replaced the battery and it still does nothing.... but the manual key itself wont unlock the door so I am completely locked out of my car.

Do I need to contact someone to get new keys? If so who exactly?

Do I need to get a locksmith and program something inside the car? I am at a loss.
 

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2017 453 ForTwo Coupe ED
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If you have a 453 model. Your battery is underneath the forward hood or service panel.
and you can open the access panel (not really a bonnet, as no engine is under it) without unlocking the car - but the horn is going to sound like an alarm when you do so if the car battery has charge.

Did you try WD40 in the door lock - if it has never been used it could just be stuck?
 

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Discussion Starter · #6 ·
My car battery is charged and doesn’t have an alarm. I already triple checked the fob battery
 

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Discussion Starter · #7 ·
and you can open the access panel (not really a bonnet, as no engine is under it) without unlocking the car - but the horn is going to sound like an alarm when you do so if the car battery has charge.

Did you try WD40 in the door lock - if it has never been used it could just be stuck?
Battery is charged car has no alarm. When intry to use the key it doesn’t even feel like its trying to do anything. Its a used car though
 

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Sounds like a lock smith is in the future. That’s crazy, you can’t open the cars door lock, with that key fob. Is there a old smart/MB dealership around your location?

Did you accidentally drop/got that key fob wet?
 

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Discussion Starter · #10 ·
Sounds like a lock smith is in the future. That’s crazy, you can’t open the cars door lock, with that key fob. Is there a old smart/MB dealership around your location?

Did you accidentally drop/got that key fob wet?
I havent dropped it or gotten it wet and the closest ones are hours away.

I suppose I am going to get a lock smith and see if I can use it and just keep it unlocked in the garage until we get some help.
 

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This threat is in "450 smart Operation and Maintenance" forum but the title says 2017 model. It is kind of confusing.

Is your driver side door handle looks like this picture?
Have you tried popping off that plastic cover at the keyhole and use your key to unlock the door?

66961
 

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My key doesn't unlock the door either.
One of the previous 2 owners snapped off the plastic plug then tried using the key jamming the remaining into the lock. I took the lock out and removed the stuck plastic. But the key still doesn't work.
I don't keep anything of value in the car, so when the top is up doors are unlocked.
I never lock the glovebox. It would cost more to replace the glovebox door than all of what's inside. Just common sense.
If someone wants my smart bad enough to steal it that's what I have insurance for.
Think about it. If a thief is clever enough to get the smart started without a key he should be a member here in posting :unsure:
 

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I just bought a 2007 Smart and was given one key. The door won't lock with the fob or the key. As soon as I can I will replace the battery in the fob but does the key not lock or unlock the door without the fob?
 

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Welcome to SCoA forum.
I'm not sure about the 2007 450 model
In the infinite wisdom of Mercedes-Benz 2008-2015 451 model smart cars were not made with the ability to lock the driver door using a key.
The driver's door if everything is working properly can only be unlocked with the key.
I repeat, smart 451 models CAN NOT be locked manually with a key Only electrically with the fob.
Good luck
JL
 

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I know a fact, my key was able to unlock the door handle. My wife took the smart to work. She was use to her Honda with self turning off head lamp. She got out of the smart car left the lights, on. Lock the door. She was going to leave work, the car battery completely dead. The only why to get in the car to jump start the car. The drivers side door handle.
 

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My '16 had a dead battery. After much angst and a few Old Milwaukee Lights, the surgery was done. Auto Zone had the right battery. Also make sure there's no birthday cake growing on the terminals. Some baking soda remedied that.
 
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