Mercedes benz vehicles such as e c s ml gl r class are designed to automatically lock the doors as soon as you start to drive.
													
																	Mercedes c class drivers door wont lock. 
									
	
		
	
																	Earlier this year the driver s door would occasionally not open unless i pressed the key fob repeatedly. 
																	The fob unlocks and opens the trunk but it just wouldn t lock the car. 
																	Even though the fob unlock it if i manually lock the 4 doors. 
																	On those models the door lock actuators may fail causing the door lock to bounce up and down several times. 
															
													
									
	
		
	
																	Hi there my w204 c class fob would not lock the car. 
																	If a door unlocks but will not lock again then replace the door switch. 
																	How to replace door lock actuator if the door locks in your c class are bouncing up and down or are otherwise not functioning properly the system s actuator might be broken. 
																	I have mercedes benz c class estate 2009 model that has developed a door locking issue. 
															
													
									
	
		
	
																	Open and close lock to. 
																	Take the blade key and press it into the slot. 
																	I took it to a mercedes benz specialist and they said it could be a door actuator. 
																	You likely have a shorted door lock actuator which you can replace with a new unit for the lock that is not working. 
															
													
									
	
		
	
																	There is a couple of ways to fix this problem. 
																	Then pull the blade key away from the door. 
																	Perhaps your mercedes locks work but they open and close slowly. 
																	This is a costly component to replace at the repair shop but it is something you can do at home. 
															
													
									
	
		
	
																	Our local mechanic couldn t identify a problem. 
																	To access the mechanical lock find the small slot located underneath the door handle. 
																	Apply wd 40 or equivalent product directly into the lock. 
																	It seems to only play up once a month or so but now the front.