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Most of the time it's because you have your car in the wrong gear. The key will not start the ignition if your car is in anything but park or neutral.

Another common cause with vehicles equipped with any sort of ignition engaged steering wheel lock is that the steering wheel is turned and putting pressure on the locking mechanism. Try turning your steering wheel (left or right) in such a way that the pressure is taken off of the ignition lock while turning the ignition key.

A caveat to anyone owning a Nissan with a non-electronic key (mostly 1990s):

This is a shoulder-stop type key, which means that all the force of each insertion into the lock is absorbed by the shoulders.

The keyway is deeper than the blade of the key, and, after a while, shoulder wear allows the flats on the key to travel past the wafers inside the lock that the key should operate.

This causes a "false lockout" condition, which can be overcome by simply pulling out slightly on the key as you turn it. If you have ever tried to have a misbehaving key copied, you probably already know that it works no better or not at all. This is because the key shoulder is the reference point for the key machine guide, and it is missing.

Bottom line: take your Nissan to a qualified locksmith, have them decode the key and cut a set of original keys for you. Unless the locks are badly damaged from overuse of bad keys, an original key should work very smoothly.

Groucho

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Q: What causes the key not to turn in the ignition?
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