put the key in the ignition, turn the steering wheel to the left and while trying to turn the key. i had this happen to me about 8 months ago. but i was unsure as to what made the key work again....the fact that i turned the key in the ignition while turning the sterering wheel or the fact that i sprayed the key with liquid wrench prior to inserting it in the ignition.....model i have is a 1990 190E 5.6

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1990 190E 3.0L