The locks tend to give a bit a warning before they go. They make a sort of 'whirring' sound prior to the 'machine gun'. Basically the inner plastic mechanism eventually fails and is not repairable. Once you start to hear any sounds, it is best to lock only using the key (on my car the superlock and lock occur at the same time, that is how it was programmed) and plan on replacement ASAP. This is what happened to me earlier this year. Of course, as others have said, it is best to make sure the lock is lubricated regularly to help ensure longevity. Replacement is fairly straightforward as long as you can open the door!

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