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How to Fix a Mercedes Ignition Key That Won't Work One of the most annoying things to deal with when you own a Mercedes is an ignition key that doesn't work. could also be a sign of other problems. There are three main reasons for Mercedes Benz ignition key problems. They are a bent key as well as a loose cable and an electronic switch that's malfunctioning. Loose Cable Untight cables could cause your mercedes ignition key to be stuck in its place. This issue can be resolved by simply tightening t