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Key fob wont turn in my mercedes E 350

I can't turn the key and I Mercedes 2007 E classwhats the problem with this car

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I also cant turn my 98 clk 320 key in my ignition . im locked out from even unlocking the igintion lock .. Frustrated and confused... May it be the anti theft. System? If so how do i by pass that

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You need to change the battery in the fob . This video may help.

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Lisa Cruz crwdns2934231:0crwdne2934231:0
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