I lost my car keys and the ignition key is not the same as the door key

SOURCE: ignition key does not work in door locks

try getting the key made then go down to a VW dealer and they should be able to reprogram the remotes for about 60bucks

SOURCE: lost ignition key and replace it, then car would not crank

That is true its part of the antitheft system.

SOURCE: My Spare Key Won't Start My Car

ok well here's the thing. This key has not been used before. The keys are cut to the specs of the ignition so they may be undercut so to speak. I know on my car i can turn it upside down it will work. But on the other hand it could just possibly be a back up for when you lock your keys in your car (not likely but it's still possible). You can keep putting your key in and out a bunch of times and **** the steering wheel back and forth as you turn the key to get it used to the ignition switch. See if that works and if not i will see what i can come up with in the meantime for this exact car.

SOURCE: My electronic key has been lost and my valet key which used to work, won't unlock the door.

I found the automatic key in my wife's car. Thanks

SOURCE: have mercedes E class key fob will not open doors,

If key will not turn
Car battery flat,charge or jump to activate elec ignition