I took it to a mercedes benz specialist and they said it could be a door actuator.
Mercedes benz c class door lock problem.
Apply wd 40 or equivalent product directly into the lock.
Take your mercedes benz for a test drive.
Open and close lock to recalibrate.
Earlier this year the driver s door would occasionally not open unless i pressed the key fob repeatedly.
I have mercedes benz c class estate 2009 model that has developed a door locking issue.
The way that this fix works is by creating resistance at the door lock pin.
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This prevents the door lock pin from bouncing up and down when you lock the door or when the doors lock automatically.
By jeffrey bausch may 18 2015.
After trying the spring pack and dismantling the lock and replacing small spring inside car lock would only lock or unlock and involved gringing my inner doo.
Your door lock should not bounce up and down anymore.
If a door unlocks but will not lock again then replace the door switch.
Our local mechanic couldn t identify a problem.
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This is a costly component to replace at the repair shop but it is something you can do at home.
Perhaps your mercedes locks work but they open and close slowly.
Ensure the door pin can go up and down.
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.
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