Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi, my name is***** the steering lock unlocks it tells me that the key is being recognized. If the key will not turn after the lock unlocks I would say that the ignition switch is at fault. It's also possible that the steering lock is unlocking but not sending the confirmation to the ignition switch. It's always a good idea to try a second key but this sounds more like an ignition switch or steering lock failure. You should also make sure that the car battery is not weak.
Let me know if you have any questions.