Question about 2003 Mercedes-Benz C-Class

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MY WILL NOT START THE CAR C240 MERCEDES BATTERY IS NOT DEAD

I HAVE A C240 2003 MERCEDES. MY KEY WILL NOT START THE IGNITION. THE BATTERY IS NOT DEAD. THE REMOTE WILL UNLOCK/LOCK THE CAR, BUT WILL NOT START THE CAR. WHAT WOULD CAUSE THIS PROBLEM?

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I am assuming that the engine won't even turn over. could be lots of different things. The simplist is to make sure the car in in PARK , won't start if not. Other things could be , Security imobilizer if you have one. Does your key have a electronic chip in it ? Try your other set of keys if you have one. Check if battery connections are clean and tight.

Posted on Jun 04, 2009

  • Ladislav Plesnar
    Ladislav Plesnar Dec 31, 2013

    i had same problem and just changed key and works , thank you

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A common problem with these cars is the Brake Light Switch.
The car has to recognize that it is in park before the key will start the engine. It's an inexpensive part that you can change yourself, just make sure you get a genuine Mercedes version (about $45 at the dealer). Follow the brake pedal up to the top of the bracket that holds the pedal and you will see a small device (the brake light switch) with wires coming from it.
Is the brake lights coming on? sometimes you can tell it's the switch by that as well.
Hope this helps!

Posted on Nov 14, 2014

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