My 2006 Mercedes E500 passenger side door will not lock. When I press the lock button on the key fob, the knob on the door slides up and down but will not lock. When manually depressing the knob to lock the door it works. Is anyone else having this problem with their mercedes? I'm also wondering why this is happening, should i bring it to the dealer to fix it or is it an easy DIY fix? Please reply :bowdown:... Thanks!