The most common cause for a Mercedes-Benz not to start is a dead battery. Try charging the battery to see the automobile will start.
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5.8 to 6 quarts thanks Raj Ratnasamy
Because there are tumblers in the lock where you put the key in. When you put the right key in, all the tumblers are put in the right place and all the sensors are then turned off so the car will start. When all the tumblers are not put in the right position due to a bad key, the sensors stay on so when you turn the key, the cr won't start and the antitheft alarm goes off
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.
in the key hole
I'm sorry if this sounds silly, but did you put the battery in backwards?