"You could, assuming that your steering lock is truly unlocked and will stay that way, break into the wiring and add a toggle switch to turn on the ignition and a push button to activate the starter. It is a matter of spending a lot of money to have a key that works or $10 to be able to start the car.

If I can start the car in this manner, would the steering lock disengage?? I could do this hotwire job in about 10 minutes.

I used to have a pushbutton starter and had only used the key to power the systems up, after deciding against a totally keyless system. I could easily re-connect an on/off switch to the wires that power up the ignition components so that the car is driveable, however, if the steering lock stays engaged, this effort won't be of much use.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black