Flip Key Blade Broken, Why It Snaps and How It Is Fixed

A flip key blade snapped off the fob usually leaves the car able to start, because the chip and the remote sit in the fob rather than in the blade. Most fobs are repaired rather than replaced.

That is the good news, and it holds on the large majority of vehicles. What matters more is the reason it snapped, because the blade is rarely the thing that was actually wrong.

Will the car still start?

On almost every a flip key, the transponder chip and the remote circuit live inside the plastic body, not in the metal. The blade is a mechanical part that turns the lock and nothing else. Snap it off and the electronics are untouched.

So the car recognises the fob exactly as before. Hold the broken blade in the barrel, or hold the fob near the reader on a car that expects it there, and the engine starts.

Two situations break that rule.

The break happened inside the key rather than at the blade. Where the fob was dropped hard or opened badly, the circuit board can be damaged at the same time. The sign is a remote that has stopped locking the car as well as a blade that has come away.

Part of the blade is still in the lock. That is a different job and it is covered further down, because nothing else matters until the piece is out.

Away from those two, the car drives. What it does not do is stay reliable, because half a key in a pocket gets lost and the stub that is left puts uneven force into a barrel that is often already the problem.

What actually broke

A flip key is built in two halves. The fob carries the electronics and the battery. The blade folds out of it and is held in place by a small pin passing through a moulded plastic bracket, usually called the blade holder.

That bracket is the weak point of the whole design. The pin passes through a hole in it, and the plastic around that hole is thin by necessity, because the bracket has to fit inside a key somebody carries in a pocket.

Every time the key turns an ignition, the force applied at the end of the blade is carried by that small area of plastic. It does not fail suddenly. It fractures slowly around the pin hole until the last turn separates the two halves.

That is why the metal itself is almost never what failed. The blade comes away intact and undamaged, and it is the plastic that gave up.

Why flip key blades snap

Four things account for nearly all of it, and they compound.

The design. The blade holder is thin where the pin passes through it, and on a number of popular models it is thinner than the job asks of it.

A heavy keyring. Weight hanging off the key in the ignition works the joint every time the car moves, which is the same force in miniature applied thousands of times.

Mileage and use pattern. A van used for deliveries takes the ignition on and off many times a day, so a three-year-old vehicle reaches the wear of a six-year-old family car.

A stiff ignition. The largest cause by some distance, and the one that carries on after the key is fixed.

The stiff ignition behind it

A healthy ignition turns with light finger pressure. As the barrel wears, or the housing behind it begins to bind, the last part of the turn gets heavy, right at the point the engine cranks.

The driver does not usually notice it happening, because it arrives over months. What happens is that the hand quietly starts applying more force, and all of that force passes down the blade into the thin plastic around the pin.

So the sequence runs one way. The ignition stiffens, the driver turns harder, the blade holder fractures, the key comes apart. The key is the thing that broke and the ignition is the thing that was wrong.

This is why a blade fitted to a car with a stiff barrel snaps again, sometimes within months. The repair holds only where the cause is dealt with at the same time.

Worth checking, then, is whether the ignition will not turn easily, and whether the spare key feels the same in it. Where both keys feel heavy, the fault is in the barrel itself rather than in the key.

The wobble that comes first

Blades give warning before they go, and almost nobody acts on it because the warning is so small.

The sign is play. The blade develops a slight side to side movement where it meets the fob, or it no longer snaps out crisply and instead flops part of the way. On a key that has always felt solid, either one means the bracket has started to crack around the pin.

From that point the break is weeks or months away, not years. A blade dealt with while it is only loose is a straightforward repair on the existing fob. The same key after it separates on a Sunday, miles from home, is the same repair at considerably more inconvenience.

Where a key has begun to wobble, it is also worth trying the spare, because a spare that feels tight confirms the fob rather than the car.

Repair or a whole new key

A snapped blade rarely means a new key, and three cases cover almost everything.

The blade and the electronics are both sound. The usual case. The existing chip and remote board are moved into a new housing and a blade is fitted, so the key you get back is the key the car already knows. No programming is involved, because nothing about the identity has changed.

The blade is worn as well as broken. Where the metal has rounded off over the years, a fresh blade is cut to the original code rather than copied from the old one, so it fits the lock the way the first key did rather than the way the worn one did.

The electronics are damaged too. The only case that genuinely calls for a new key, and it is the least common of the three. Here a replacement is supplied and programmed, and on some makes the chip is tied to the vehicle record in a way that makes this step longer than people expect.

Deciding between them takes a look at the key rather than a description over the phone, which is why an honest answer on a repair is given at the car and not before.

The blade is cheap, the job is not

Search for a flip key blade and you will find the metal listed for less than the price of a coffee, and a plastic repair case for not much more. Then a quote for the work arrives and the two numbers look unrelated. Three things sit between them.

A blank blade is not a cut blade. The metal as sold has no cuts in it at all. It has to be cut to the pattern your locks expect, which is done from the code held against the vehicle rather than by copying the broken half.

The electronics must survive the move. Getting a chip and a circuit board out of one housing and into another without damaging either is the skilled part, and it is the part the listing does not sell you.

The failed key still has to work afterwards. A repair is finished when the blade turns every lock, the buttons work, and the engine starts, and that is tested before anyone leaves.

The listed parts are honest about what they are. They are components, and the price of a component has never been the price of a working key.

What can go wrong doing it yourself

Plenty of people repair these keys themselves and plenty succeed. It is worth knowing what is being risked before starting, because the part that gets damaged is not the cheap one.

The chip. The transponder is small, brittle and sits close to where the housing is levered apart. Break it and the key is no longer a repair job, it is a replacement and a programming job.

The circuit board. The remote track is thin and lifts easily. A board creased during the swap gives a key that starts the car and no longer locks it.

The blade pattern. A blade cut by copying a worn one copies the wear as well, which is how a fresh blade turns worse than the one it replaced.

The cause. The part nothing in a repair kit addresses. A perfect self-repair fitted to a car with a stiff ignition snaps again.

On the makes where the chip is written to the vehicle record at the factory, a damaged chip is markedly harder to put right than on makes where a blank key is cut and coded, which is worth knowing before the housing is opened rather than afterwards.

If the blade snapped inside the lock

Everything above assumes the blade came away cleanly and the broken piece is in your hand. Where part of it is still in the ignition or a door lock, that is a different job and it comes first.

Nothing else can be assessed while metal is sitting in the barrel, and attempts to hook it out with pliers or glue almost always push it further in or damage the wafers. That work is left inside the lock to someone with the right extraction tools, and the key repair follows once the barrel is clear.

How long a flip key repair takes

A straightforward transfer into a new housing with a blade cut to the code takes 30 to 45 minutes at the vehicle.

Where the electronics are damaged and a replacement key is supplied and programmed instead, allow 45 to 90 minutes depending on the make.

Where a piece of blade has to come out of a lock first, add 20 to 40 minutes before the repair itself starts. All three happen where the car is parked rather than at a workshop.

Getting a flip key blade replaced

Four things settle a flip key repair before anyone travels.

The registration, which gives the make, model and year and therefore the blade pattern. Whether the remote still locks the car, which separates a blade job from an electronics job. Whether any part of the blade is still in a lock. And whether the ignition has felt heavy lately, which decides whether the key is the whole job or half of it.

With those four, a flip key repair is quoted properly and carried out at the car, with the original electronics kept wherever they have survived.