Cl500 key fob issue please help!

[Alistair1988]

So currently I have a key fob that doesn't seem to unlock the car when I press the fob however if I press the keyless button on the passenger door it unlock the car but to lock it I have the press the button on the drivers door..... the start stop button works fine.... I have no idea whats going off but I could do with sorting it as I don't have a spare key

 

[mioba]

Get your car to a good indy with STAR, sounds like a module somewhere on its way out.
Also get a spare key, for the price via vis not being able to use your car coz you lost a key is a no brainer

 

[brandwooddixon]

That looks more like the old style keyless-go card rather than a proper key fob.
In that age of W215 they originally came with two key fobs (with key blades inserted/hidden down one side) and two keyless-go cards if Keyless-Go fitted.
If you only have the one then potentially 3 keys floating around with access to your car.
Best get a replacement and have the other key's registered codes cleared from the car.