I have a 2006 Lincoln Zephyr. On several occasions the vehicle would not start until I slightly turned the steering wheel at the same time I turned the key. The Ford Dealership told me that that it was an anti-theft feature. When the steering wheel is in the locked position the vehicle will not start unless the steering wheel recognizes that the correct ignition key is being used to unlock the steering wheel. That prevents someone from stealing my vehicle with a tow truck, or wrong key. That makes sense to me because I know my starter was good and charging system. My vehicle starts immediately now when I slightly turn the steering wheel at the same time I attempt to start the vehicle. A reminder to only slightly turn the steering wheel.