Buy OEM 2004 Mercury Part # 6W3Z5421990A (6W3Z-5421990-A). Door Lock Cylinder. All Models; All; Right. Door Lock Cylinder - Repair or Replace If your keys don't turn in your door, you might need

Cylinder. Lock.
A Lock Cylinder to Lock the vehicle's side hinged door(s). Part included in Cylinder and key set. AND Amplifier. Assembly - Actuating. Door. Fender liner retainer clip.

Door Lock Cylinder

Fits Crown Victoria, Grand Marquis, Marauder, Town Car

All Models; All; Right.
Door Lock Cylinder - Repair or Replace
If your keys don't turn in your door, you might need to replace the door lock cylinder in your 2004 Mercury .