A friend has a 1992 Plymouth. As an original owner, she had one key that would operate ignition, doors and trunk. About 5 years there was some work done on the car. After that it took two keys, one operated the ignition and doors and the other key operates the trunk. I don't know what happened but I suspect the trunk lock was replaced.
My friend would like the trunk fixed to work with the main key so she only has to worry about one key. I assume that a locksmith can change the trunk lock tumblers to work with the main key. Is that correct? Assuming it is, what would be a reasonable charge for that service if she brought the car to the locksmith? She lives on the north side of Chicago. I'm trying to convince her to live with both keys but she is stubborn. ;-)