Why can't i shift my 2006 grand marquis out of park when the ignition key is on

SOURCE: my 2001 grand marquis is trying to start itself

Solenoid switch,Open hood on drivers side fender you will see the battery cables go to fender semi round looking switch.If you have a screw driver Handel give it a smack or two it should stop you will need to replace this it will do it again!

SOURCE: 2006 mercury grand marquis has clicking sounds front area of car

Have your front c.v shaft's checked out, when shaft are bad it will make a clicking noise.

SOURCE: Key won't turn in ignition

Turn the steering wheel with one hand while turning the key with the other.

SOURCE: Program keyless remote for 94 Grand Marquis

On this model you will have to open glove box and press the tabs on each side so that you can open it all the way open. You will see a 2 wire grey connector behind it.
Turn ignition switch to run postion then take a paper clip or something like that and momentarily short the 2 wires together.
The door locks should then cycle from lock to unlock.Remove the paper clip then press one of the buttons on each remote. When you press the button on the remote door locks should cycle again to confirm that it programed.Then when finished turn off the ignition switch and door locks should unlock to confirm you have exited programming mode.

SOURCE: Car won't start-replaced ignition switch on 1997 Grand Marquis.

key needs to be programed.