I'm noting your screen name and that you've lost track of three sets of keys, and am wondering if this possibly is a gag? :yelrotflmao:
The C Class will auto lock when stationary if you unlock it with the key fob and not open the door. After a reasonable period (perhaps 30-60 seconds) it will relock. But, with the door not being opened, this could not be your scenario. (The windows are all up, correct?)
The only way I can imagine your scenario with the key inside the locked car is that you got out, pressed the key fob lock button with the door open, got back in and put the key down, got back out and closed the door. If you lost the key in the car, would you not see it in the ignition or possibly in the console cupholder? Where else is the key loose and not either in the ignition or your hand when you are in the car?
The doors cannot be manually locked with the doors open. The only way I can imagine this happening is you have the door open press the lock key on the fob then throw the key into the car. If you did this you should not be behind the wheel of any car.
You said you want to know if this car Auto Locks and if I could have locked them in the car before I go tearing around the house looking for my keys, right? But, if someone says it is possible--then you will have to tear your car apart. That's not good, right? So, how about this genius idea: check to see if left them where the two other sets are?
I have almost locked mine in the trunk a couple of times. Car locked , trunk open, hands full, put the keys down in the trunk and as I am closing the trunk, I realize what I am about to do and save the embarrassment.
That is a bit different situation, I think we all assumed the OP meant in the passanger compartment.
But if you had unlocked the doors as well as popped the trunk you would still be able to open the trunk manually.
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