One key used to do it all for a 1999 Taurus but now the key will open the trunk and start the car but will not open the doors. Doors and trunk open from the remote. Remote will also lock the doors and set alarm. Any hints or information appreciated. Eric
Check linkage connecting the lock cylinder to the door latch mechanism. =A0 Sometimes when people try to use a "slim jim" they accidentally disconnect the linkage instead of gaining entry into the vehicle.
If you give us full information we can give you a more accurate answer. Does the lock cylinder turn with the key?