Stuck in Park? Check to see if the brake lights are working - same circuit as shift interlock Check to see if stop light fuse blown Try turning key to 1st position (unlock) shift to neutral to start and then shift to Drive
also check to make sure the selenoid on the shift mechanism is working on mine it froze up and stopped working properly if that happens it will normally work when the interior is warm just make sure it is working or it wont let you shift.
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go to a mechanic?
You replaced the ignition lock, and it will not shift out of park? If that is the situation, it sounds like the column is out of sync. More details are required to give a solid answer. A more common issue with these is the actuator rod in the column breaks. If you replaced the lock because it was turning hard and wasnt always cranking when turned, this may be your problem instead of the lock.
Press UNLOCK on your key fob twice
Replace just the steering lock unit. The tumblers are old, and they need to be replaces. After replacing the lock, go to a locksmith, and have him re-key the doors to match your new ignition lock.
If your steering wheel is lock then it is tricky. Pry out the silver washer from the ignition key lock. Then you will need to cut the ignition switch cover with a hex saw. This process means you won't be able to use your key. You will need to get a new iginition key lock and key. If your steering wheel is not lock then you can save your lock and key. you need to put the key in run. This will match the notch on the cover and the lock. You need a special tool that has two prong that goes into the two notch. You can get it from Mercedes dealer. You should be able to pry the ignition lock and the cover out of its place.