The lock cylinder in my VX is starting to act up. It has always been a little finicky (will only turn with the key in one way; flip it over and it will not work), but it has recently taken a turn for the worse. Now it requires a lot of jiggling and baby talk before it will turn. My wife sprayed WD40 in it (I was not home), which did nothing other than coat the key in black liquid every time you remove it.
How difficult is it to replace the lock cylinder? I do not know much about working with electrical systems. I do not own a soldering iron. Should I even attempt it?
Also, my door locks have always had problems. You must pull the key out about 1/8 inch and sometimes jiggle it in order for the locks to operate. Should I get them all taken care of at the same time? (i.e. is it possible to get them all keyed the same so I do not have to use 2 keys?)
Some cars you need to pull the steering wheel to get the ignition lock off, it's unlikely you'll need a soldering iron, should be plugged in. In order to get a complete lock set, you'll probably have to go to a dealer. You could try Rockauto.com
If just replacing the ignition cylinder, avoid "standard auto parts" brand, I'm rather unhappy with the last one I had.
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If you have the original key code available you may solve your problem with a key that is cut to that code, not cut from one of your existing keys.
When you referred to the fact that you have to pull the key out 1/8 inch to work the door locks, it made me think that your problem could be a worn key.
If your other keys were cut using that worn key, then they would have the same issue.
Another way would be to have a key cut by a locksmith based on the existing cuts in the key with the shoulder problem eliminated, but that could be some serious trial and error.
Replacing the locks is pretty easy. MOST vehicles you stick a paper clip in a small hole, turn the lock with the key in it, and out it comes. Install is the reverse.
DOOR & hatch locks are MUCH more difficult because you've got to pull panels. I'd replace the locks. If the doors are not TOO difficult, then I'd do them as well.
Here's the "one key" solution - do the two keys interchange? IE you can put the door key in the locks and vice versa? If so - you are in great shape. If they are not the same shape, then you can't have only one key without visiting a machinist.
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I had the same problem on another brand of car once. The car was beat and this was the easiest and cheapest solution. I took the tumblers(the round part that you put the key into) out of the locks and removed the little pins that are matched to each bump on the key. Without the pins anything including a screwdriver will turn the lock. It's a great solution because who would ever think you did this to your locks? And it's cheap.
The only other solution you have is to buy a good used set of locks and keys. Perhaps you can find something on ebay?