Car Key Snapped in the Lock or Ignition? What to Do and What It Costs in London

A snapped key rarely arrives at a convenient moment. It happens on the school run, in a supermarket car park, outside the house at six in the morning, or in the rain when you are already late. The sound is unmistakable: a sharp crack, a lighter key in your hand, and the unpleasant realisation that the other half is still inside the lock.

Our technicians attend broken key call-outs across London, Kent, Essex and Surrey every week, and the pattern is consistent. The damage to the key itself is rarely what costs drivers money. The cost comes from what happens in the next ten minutes, when a stressed owner reaches for pliers, a screwdriver or a superglued spare. This guide explains what is actually going on inside the lock, what you can safely try, when to stop, how professionals extract broken keys without damaging the vehicle, what each route typically costs in London, and how to make sure it never happens again.

Why do car keys snap in the first place?

Car keys are made from brass or a nickel-brass alloy. That metal is soft enough to cut cleanly and tough enough for daily use, but it is not unbreakable. A key almost never breaks without a build-up of small problems beforehand, and understanding them is the fastest route to preventing a repeat.

If your key was already stiff, bent, loose in the lock or turning with effort, treat that as a warning. The same applies to older cars where the ignition barrel has worn. Our guide to common ignition problems explains the early signs, such as a key that sticks, needs jiggling or will not turn without the steering wheel moving.

What should you do in the first five minutes?

The first minutes decide whether this is a minor inconvenience or a costly repair. The sequence below applies to almost every snapped-key situation, whether the fragment is in a door lock, a boot lock or the ignition.

Key snapped in the door lock: what are your options?

A door lock is the more forgiving situation. The cylinder is mechanical, the broken piece is usually close to the surface and there is no immobiliser circuitry attached to it. That is why it is the only scenario where a careful do-it-yourself attempt is reasonable.

When a careful attempt is reasonable

• Some of the broken blade is visibly sticking out of the keyway.
• The lock is not corroded, frozen or already damaged.
• You have a proper broken key extractor, fine needle-nose pliers or tweezers and good light.
• You are prepared to stop after one or two gentle tries.

Grip the stub firmly, keep it aligned with the keyway and pull straight back along the lock axis. Do not rotate it. Rotating a broken blade turns the lock wafers and can jam the cylinder. If the piece does not move with light, steady pressure, stop.

When to stop immediately

• The broken end is flush with the face of the lock or sits deeper inside.
• The lock is rusty, frozen or gritty.
• The key had a remote, chip or fob that is still attached to the other half.
• You have already tried and the fragment has moved further in.

In these cases a locksmith with the right extractors can usually remove the piece without touching the lock cylinder. If the vehicle is locked at the time, see our page on vehicle lockout assistance, because gaining entry without damage is a separate job from removing the key.

Key snapped in the ignition: why is it more serious?

An ignition lock is not just a lock. On most cars made in the last two decades the ignition barrel works alongside the steering lock, the starter circuit and the immobiliser. Behind the keyway sit sprung wafers, a locking pin and, on many models, a reader coil that checks the transponder chip inside your key.

That has three practical consequences. First, there is less room to work, so an extractor that would be safe in a door can scratch or bend an ignition wafer. Second, the steering lock is often engaged, which holds the barrel under tension while you pull. Third, any attempt to start the car or insert a replacement key before the fragment is cleared can damage the barrel or trigger the immobiliser. If you want a plain-English explanation of how that protection works and why it sometimes refuses a perfectly good key, read our guide to car immobiliser problems and fixes.

If the barrel itself is worn or has been damaged by an earlier attempt, extraction may reveal that it needs repairing. Our ignition barrel repair service covers that case, and in many cases it is more economical to repair a barrel on site than to replace the whole assembly at a dealership.

Can you remove a broken key yourself?

Sometimes, yes, and it is fair to say so. A visible stub in a clean door lock is a low-risk repair for a patient person with the right tool. The risk rises sharply as soon as the fragment sits below the surface. The table summarises what we advise at the roadside.

Common home remedies that make things worse

• Superglue on a spare key. It bonds the key to the fragment and to the lock. The only fix is usually a new barrel.
• Screwdrivers and wire hooks. They gouge the wafers and push the fragment deeper.
• Oil-based sprays. They attract dirt and gum up the mechanism. Dry graphite or a silicone-based lubricant is far safer.
• Magnets. Brass and nickel-brass are not magnetic, so a magnet does nothing.
• Hammering or heating the lock. It damages wafers, seals and, on modern doors, the wiring behind the handle.

How does a locksmith remove a broken key without damaging the lock?

A trained auto locksmith does not rely on force. The job is a controlled sequence that protects the lock and the key data at every stage.

1. Assess. A torch and borescope-style inspection show how far the fragment sits, its orientation and the condition of the wafers.
2. Identify. The remaining key tells us the blank type, the lock profile and whether the key contained a transponder chip.
3. Extract. Purpose-made extractors with hooked or barbed tips engage the key cuts and draw the fragment straight out, without turning the barrel.
4. Check. Once the keyway is clear, the technician tests the lock for smooth operation and checks the wafers for burrs or damage.
5. Restore. If a replacement is needed, the key is cut from the code or from the broken pieces, then programmed to the vehicle where required.

Many drivers assume that an extraction means the lock will need replacing. It does not. In our experience a lock cylinder that is stiff or worn before the key breaks will often be fine afterwards, as long as the fragment was removed cleanly. If the cylinder was already failing, we say so on the spot and explain the options.

Repair, replace or reprogram: what happens to the key?

Once the broken piece is out, the next question is what to do about the key. The right answer depends on what kind of key you were holding and which part broke.

Our car key repair service handles damaged blades, cracked cases and failing remotes. If the key is beyond saving, our car key replacement and car key programming services produce and code a new one on site.

How much does a snapped key cost to fix in London?

Prices vary with the make, the key type, the time of day and how deep the fragment sits, so any honest figure is a range. The indicative London figures below show where most jobs fall. Always ask for a clear quote before the technician starts, and be wary of anyone who will only give a price after arriving.

The biggest hidden cost in a snapped-key situation is towing. A vehicle with a broken key in the ignition cannot be driven, and a dealer visit means moving it. A mobile locksmith works where the car is parked, which removes that cost and the lost day that goes with it.

What proof of ownership will you need?

Any reputable locksmith or dealer will ask you to prove the vehicle is yours before cutting or programming a key. That protects you, and it protects the vehicle from theft. Have the following ready when you call:

• The vehicle registration and make, model and year.
• Photo ID such as a driving licence or passport.
• The V5C registration certificate, or other proof such as a purchase invoice or insurance document.
• If you lease or use a company car, authority from the owner.

If you cannot find your logbook, the government explains how to get a vehicle log book (V5C) and what the document shows.

Smart keys, fobs and transponders: what is different?

Modern keys carry more than metal. A transponder key contains a small chip that the immobiliser reads before it allows the engine to run. A remote key adds buttons and a radio transmitter. A smart or proximity key may not have a conventional blade at all, only a hidden emergency blade and an antenna that communicates with the car.

Because of this, a broken key is not always just a broken piece of metal. A cracked fob case can often be repaired by swapping the electronics into a new shell. A snapped emergency blade does not affect the electronics at all. But if the chip itself is damaged, the key must be replaced and a new one programmed to the car. On some European models that means working with the vehicle security system, which is why a locksmith with proper diagnostic equipment matters.

If your broken key was the only one you owned, you are also in a lost-all-keys situation as far as the car is concerned. That is a more involved job than copying a working key, which is a good reason to keep a spare. We explain why in our guide on why every driver should have a backup key.

Will insurance, breakdown cover or a dealer help?

It is worth checking three places before you pay out of pocket, although none is guaranteed to cover a snapped key.

• Car insurance. Standard comprehensive policies often exclude lost or broken keys unless you added key cover. Check your schedule for a key replacement benefit and its excess.
• Breakdown cover. Some providers will attend and help, but many do not cut or program keys themselves. They may arrange a locksmith, and the cost can still fall to you.
• The dealer. A dealer can supply a manufacturer key, but you will usually need to get the vehicle there, and the process can take days. For some newer or imported models a dealer is the only route, and a good locksmith will tell you honestly if that is the case.

How can you stop a car key snapping again?

A little maintenance goes a long way. Most of these habits take seconds.

A spare key is the single best protection. It turns a snapped key from an emergency into an annoyance. Our spare car keys service cuts and programs a backup at your home or workplace, so you never need to be stranded again.

Where do we attend snapped key call-outs?

Quick Vehicle Keys is based in Kent and provides mobile auto locksmith services across the South East. We travel to your car, whether it is parked outside your house, at work, in a car park or at the roadside. Our regular coverage includes:

• London and south-east London: Abbey Wood, Bexleyheath, Belvedere, Bromley, Charlton, Chislehurst, Crayford, Eltham, Erith, Greenwich, Sidcup, Thamesmead.
• Kent: Dartford, Gravesend, Maidstone, Medway, Chatham, Gillingham, Rochester, Sevenoaks, Tonbridge, Tunbridge Wells, Canterbury, Faversham.
• Essex: Brentwood, Chelmsford, Romford, Southend-on-Sea, Grays, Thurrock, Tilbury, Basildon area and nearby towns.
• Airports: Heathrow, Gatwick and Stansted, for travellers who arrive to find a broken key.

Because each location differs in traffic and parking, we ask for your postcode, vehicle and a short description when you call, and then give a realistic arrival time. If you are somewhere not listed, ask us anyway.

Why trust Quick Vehicle Keys with a broken key?

We cover all vehicle makes and models, from everyday hatchbacks to prestige models. We work with remote keys, transponders and smart keys, and we offer a 24/7 emergency service for urgent situations.

Frequently asked questions about snapped car keys

The bottom line

A snapped car key is stressful, but it is almost always fixable on the spot. The most important thing you can do is stop, keep the pieces and avoid force. A visible stub in a clean door lock is the only case where a careful home attempt makes sense. Everything else, and especially anything in the ignition or involving a chip, is faster and cheaper when it is handled by someone with the right tools. Once the fragment is out, you can decide whether to repair, replace or reprogram the key, and add a spare so that a snap never leaves you stranded again.

Prices and timings in this guide are indicative and vary by vehicle, key type, location and time of day. Last reviewed November 2026.