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It can't be the valet key because the valet key works the opposite...It opens the doors but not the trunk. That model car has almost like a "double lock" on the trunk. If you put the non-valet key in the trunk keyhole and turn the key all the way to the right and remove the key while turned all the way to the right it will lock and re-lock the trunk to where the valet key will not be able to open it. They made it that way so you can lock pesonal items in your trunk, keep the original key, give the valet the valet key, and the valet cannot open the trunk. You might want to check the lines for the central lock system by the Drivers side door for a leak. That system is ran by a pneumatic pump located under the back seat. Does the key work in the front passenger's door? If so then its probably the actual lock on the drivers side door. Hope this helped you out.

AnswerI think you are using the valet key. Answer:Drivers side door is the most used lock so it wears out faster. On my 190-E it seams the key goes in to far and won't work. But I'm willing to bet if you slide the key in slowly and turn it lightly you can get the drivers side door to unlock every time.

Hope this helps.

When this happens it is usually one of three things:

1) You have a bad key/lock: If it is not the valet key and the key unlocks other doors this is probably no the case. It is not likely that the tumblers in the lock have worn down but it is possible that the lock is dirty or is not lubricated right. I would first start by spraying WD-40 into the lock and on the locking mechanism that actually locks the door (the claw that hold the door shut) If this does not work then...

2) You have a bad linkage. Inside the door everything is attached and at times it comes apart or dislodged. Sometimes you can have a plastic retaining piece or or attaching piece that has become brittle. You can take off the door panel and get a good idea of how thing work by moving the inside handle or using the power locks. If every thing is connected in the linkage then...

3) You have a bad actuator. This is the actual electronic piece that locks and unlocks the door. I is usually on the inside left bottom (if looking from the inside). It can wear out and allow certain parts of the lock to work (ie key less entry, inside door handle, power locks) while giving difficulties to other part (ie the key) I hope that this helps.

Answer:

It is a very simple repair, there is a broken spring on the lock. Go to the hardware store and buy a spring that has long ends. You will need to remove the door panel and locate the linkage that comes off the inside door handle and trace it over to the door lock ( it should have a yellow plastic end on it just below the lock) connect one end of the spring to it then the other to the clip that holds the lock in the door this should correct your problem. If the spring is to tight it will prevent the lock from working, readjust the spring and try again.

I was unable to ad a pic to help, if you need it contact and I will email it to you.

I sure this will correct your problem.

2011-09-13 17:11:13
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Q: Why wont the key lock or unlock the drivers side door but it does lock and unlock through the trunk how do you fix it?
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