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Q: doesn't start with first turn of key on 2001 Mercedes-Benz S500

Intermittently, my car will not turn on or start with the first turn of the key. I have replaced the battery in the key and then got a new key($200.00+)...still happens. any ideas?
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Sounds like your ignition switch is intermittently beginning to fail, Have a tech check it with a meter, here's a site that has them much cheaper than the dealer http://bit.ly/hUQYR
SAME THING HAPPENED TO ME!!! I had to leave it with my mechanic for over a week for him to figure it out--but it was a sensor that was telling the car it was hot when it really wasn't. tried bunch of other things that didn't work, but it hasn't happened again since replacing the sensor.
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