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Date registered: May 2006
Vehicle: 2001 E320 - Brilliant Silver/Ash: 107,000+
Location: West Virginia, USA
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
On my car the key batteries are not needed to start the car, only for the remote functions to work. Since you have replaced the ignition switch maybe it has something to do with the EIS (electronic ignition system). Some people have cleaned the window in the key and some part around the ignition switch that communicates with that end of the key. Another possibility is your key has gone bad and that's why I suggested you try your spare.
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