That would depend on several factors. The location of the lock and what need to be done. Is the problem the lock itself or the linkage connected to the lock ( as in a car door that was improperly opened with a slim Jim or coat hanger). The charges would depend on what parts need to be replaced, if any and the labor involved.
Call your local locksmith and get an estimate.
Yep, not for years, and since its a small car I can't be bothered to fix em
New locks
lock smith are the people that fix locks and make them
Nonfunctioning door locks and security system can because by a bad fuse. Replace the security system for use with a new fuse. Most of the time this will fix the problem.
You need to tell us what the fault is. If the locks have become difficult to turn with the key (as Ford locks do) then just squirt some Duck Oil (Duck Oil is now a Swarfega brand) into them. A squirt of Duck Oil will also stop your locks from freezing up in the Winter.
Yes you can you just ignor the steps that involve the door locks.
Get a professinal to fix it
I would assume it will cost anywhere from $100- $300 to fix your car brakes. Because they are an important part of your car it can be expensive to fix them .
There are many ways one can unfreeze their car locks. One can unfreeze their car locks by using a product such a a de-icing spray or pouring boiling water on them.
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Purchase a Haynes Manual and they can detail the troubleshooting. It can be bought from a parts store or bookstore. They have one just for your car.
You probably just need to fix the latch. There are some repair shops and locksmiths that specialize in car trunk locks.