Try using the second key if you have one. Does the key not working look like it is bent? The ignition cylinder may just be worn to the point that it needs to be replaced.
SOURCE: spare key for c230 mercedes benz
does it have a chip in the key ? if not any locksmith can make you one
SOURCE: Ignition failing to start -S280 MERCEDES BENZ 1999 MODEL
Crank shaft position sensor is bad. This is the most common failure. Its location is on the rear drivers side of engine, where the transmission bell housing mates to the engine, only one small bolt and a two prong electrical connector hold it on. Usually will not throw a trouble code. If you remove it you can test it with an ohm meter, will have an erratic reading or read open loop, can malfunction intermittently or permanently after parking vehicle and won't restart. Applying some heat source to it during ohm testing with a hot air heat gun will usually cause the sensor to read open loop if your not sure if its bad or not. This reply is probably way to late, but I just happened to come accross it while online. Harry (master certified MBZ diagnostic tech)
SOURCE: 1999 Mercedes Benz CLK Old and New Key will not turn ignition
hi,seem your esl or electronic steering lock mechanism is defect,since you replaced with key,ty
SOURCE: 1995 Mercedes Benz C220 will not start, and key
hello,steering lock mechanism and your key need to replaced,if you want try to remove your under dash,steering lock mechanism have a small pin(around 5 mm) which pit to steering housing,drill out the lock,then try to turn steering wheel,ty
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