Check the cut pattern on your key. See if it has one or two small high spots. Mine has one, and after a fairly short time, one side's high spot will shave off just a little from sliding into the lock itself. When it does, my key will only work in the driver's door and ignition, not the passenger side door or back hatch. If yours seems to have this problem, get a new key made using the good side of your key for BOTH side cuts. Better yet, get a couple extras made and save the best one as a "master" key, only to be used for making new copies, NOT opening the doors. I hope this helps.