I heres for a long time that the merecedes a class have a problem what this problem cause i have one to buy?

Here are links to find out cause of battery drain on your car. Process is same for all cars:-
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0CCoQFjAC&url=http%3A%2F%2Fwww.wikihow.com%2FFind-a-Parasitic-Battery-Drain&ei=2T1GVdfvHYuegwTw64DQDQ&usg=AFQjCNEMQlhRDjnfTJDuPxXw5NkTCYTLJA&sig2=uAApRk7pOCQn-Owe0DSSHQ

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB4QtwIwAA&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DPYUoXApI89Q&ei=2T1GVdfvHYuegwTw64DQDQ&usg=AFQjCNFpFmLnPQGdb0MLQKRGHYs99mg4bg&sig2=n46mnzlery-HRwffELHA2A

Check on BBB Industries online for the wiring and component diagrams for your MB and check the appropriate fuses and or relays.

this usually happens when you change out the battery. Our have loose connections.

The steering may be torque locked with the ignition lock.... pull hard on steering wheel in one direction and then try it.... if not try to pull the steering wheel in the other direction... happens all the time... Hope it's that simple! let me know how you make out and we'll go from there

Possible short in wiring to courtesy step lamp in lower edge of door.

Will need to check wiring in door and where it goes through to the A pillar.

The window is also powered so loom to window may be culprit but being it was not opening or closing at the time, maybe not.

Economic repair ? Oxymoron with a Mercedes. Check with a local independent repair shop , most don't want to mess with wiring problems.

Once the complete interior panel is removed you may see what needs work.

i think your motor is ended

8 quarts including the filter. please make sure you replace it with one from merecedes benz. this needs to be purchased from the dealer as a special tool.

catalytic converter left bank

Sound like the EIS. The EIS is the electronic ignition sitch. Cant see both the keys goin down at the same time. Very expensive switch is about 320 u will need coding key also thats about 150. These will require coding with diagnostic equipment. We charge about 150 to fit switch and code with our computer.
Good luck!
Carlo@ss

call your nearest mb dealer and supply them with the vin number is the vehicle id number located in lower left front of windshield and they will charge you a fee for it /good luck