Mercedes-Benz W140 door will not open from the inside handle
W140 door will not open from the inside handle even though the lock knob rises, what is the cause?
Usually the door lock mechanism is stuck. A small spring-loaded link or the handle lever can seize because of dried-out grease, rust or ice. A piece of a plastic clip that has fallen inside the door can also block the latch movement.
How do I get a stuck door open and the lock working?
First try turning the inside handle slowly and gently, because a quick pull can bypass the lock. You can spray petroleum jelly spray or penetrating oil into the locks and at the inside handle, and the mechanism can be greased with synthetic grease.
What if lubrication does not help?
Then the fault is mechanical. The door trim has to be removed so that the lock mechanism links and the latch are visible. A broken or detached part is replaced, and a loose piece of plastic is removed from the mechanism.
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