I am renting a 2009 lincoln town car and locked the keys in the trunk. Does anyone know the default code for Lincoln? Thanks, Mike Stack

Does the car not have a manual key lock? Look in your owners manual

https://searchmanuals.net/search7/?keyword=%2Bowners+%2Bmanuals&gclid=CjwKCAiAqt7jBRAcEiwAof2uKwzE1jBmBNKl9hqWd4TyeToXsj80tGOrdxRc3s6LGEWtoEA-xsOXLBoCIhQQAvD_BwE

Try spraying the mechanism with WD 40 and manually manipulate the lock. Make sure the latch has not somehow moved to a closed position even though the trunk is open. With the trunk open look at the locking mechanics and click your remote and see if anything is moving.

Typically on the card.. in the owners manual bag...
(black leather case)

Also said to be on the lock module inside the trunk...

the car thinks you are stealing it. get out of the car with keys in hand. lock all doors hood trunk etc. open car with key in the door. reenter car retry starter

if theres no trunk release check the top of the rear seats for a button or tap to push or pull and the seats should fold down most cars that year had them but not 100% sure if yours does hope this helps

How can a lock not lock or unlock with a physical key? Maybe the cylinders are frozen? Try squirting a little oil into the locks.
1996 Town Cars have keys and keyless entry. The physical keys are two, an ignition key and a door key. You can't use the door key in the ignition, nor the ignition key in the door. They aren't interchangeable.
The default key code for keyless entry is posted on the right trunk hinge, inside the trunk.

most common causes are rear stabilizer links,or sway bar bushings. also check exhaust hangers(rubber mounts) or heat shields.

under the trunk lip (directly where the latch goes into the lock jaws; remove the carpet so that you can see the side of the trunk latch; on the latch jaws (bottom) is a switch that contacts the latch (top) this switch is broken or, mis-aligned it opens (stops the trunk motor) when the latch contacts it.

my trunk release button dosent work i just bought the car and it dosent have a key for the trunk?

The problem is the door lock accuator's and there are four of them, one in each door, they cost about $70.00-$125.00 each