Car keys · London
Spare Car Key Duplication in London
A teenager just passed a driving test and reasonably wants a key of their own rather than negotiating over the family's single copy every time the car is needed.
In plain words
A vehicle that arrives with only one working key is a common situation after a private sale or an estate transfer, and it is one of the more straightforward calls a locksmith takes. Working from the single key and the vehicle itself, the blade is duplicated or cut to code, and the immobilizer chip is matched or freshly programmed so the new key is recognized on its own. Both keys are tested in the doors and the ignition before the appointment ends, which also gives the vehicle a documented second key from that point forward instead of an unknown history.
How the visit goesA lockout last month ended with a locksmith opening the door and going home, and the same single key has been carried ever since with nothing behind it. The relief of getting back in faded within a week into the same exposure.
Spare Car Key Duplication
How the visit goes
Confirming what the spare needs to do
Not every household wants an identical twin of the original. Some ask for a plain mechanical spare with no remote buttons at all, useful for a valet or a young driver who does not need trunk release or remote start. Others want every function the first key has, cut and coded to behave exactly the same in anyone's hand. Settling this before work begins decides which shell is ordered and how much programming the visit involves, and it is worth revisiting if the household's answer turns out to differ from what the person calling first assumed on the phone.
Working from a used or single-key vehicle
When only one key exists for the vehicle, the whole process leans on that single copy: its blade is traced or measured, its chip is read where the system permits it, and every remote function it performs is noted before work starts, since there is nothing else to check against. The new key is built to match, then tested on its own, away from the original, to confirm it genuinely operates independently rather than only appearing to work while the first key happens to be nearby with its own signal still in range.
Fewer surprises through the seasons
A tested spare carries a household through the situations that tend to arrive without warning: a fob battery finally dying in the cold, a blade thinning out after years on the same ring, or a key simply not being where it was left that morning. None of those moments needs to become a locksmith call anymore, because the second key was already proven capable of everything the first one does, sitting wherever it was agreed to live, ready for the day it is actually needed.
Spare Car Key Duplication
In the van
Key duplicating machine
Diagnostic port programming interface
Remote-head key shell
Deburring file
VIN and key-system reference
Spare Car Key Duplication
What affects the quote
Copying versus diagnostic programming
Some vehicles allow the chip to be copied directly from the original in one step, while others need the locksmith to connect through the diagnostic port and have the vehicle's own module enrol a freshly coded chip, which takes longer at the car.
Fob battery and physical condition
A fob that needs a fresh battery or shows cracking or water exposure adds a small amount of extra work beyond programming a key that is otherwise in good shape.
Aftermarket alarms or remote starters
A factory system wired into a third-party alarm or remote starter can add extra steps to programming, since the added equipment sometimes changes how the vehicle's module responds during enrolment.
What to have ready
- What year, make and model is the vehicle?
- Does the key have buttons, a chip, or neither?
- Where is the vehicle usually parked?
Spare Car Key Duplication: questions
QuestionsWhat if I have lost track of how many keys already exist for the car?
That is worth mentioning when you call, since it changes the plan. If the count is genuinely unknown, or a key was lost at some point and never accounted for, reprogramming the vehicle to accept only the keys currently in hand is often the sounder route, rather than adding a new spare on top of an uncertain set that might include a key nobody can locate anymore.
Is there a reason to make a spare now rather than waiting until the original is lost?
The whole process depends on having a working key to read or trace from, so making the spare while that key still exists is simpler than the alternative of proving ownership without any key present and building access from scratch. A spare made now also means a future lost key is solved by reaching for the second one already tested and waiting, rather than starting the whole process from nothing.
Why does the VIN matter for making a spare key?
The VIN identifies the exact immobilizer generation and lock system your particular vehicle left the factory with, which decides whether the chip can be copied directly or needs to be freshly coded through the diagnostic port, and which blank and blade profile are correct. Two cars that look identical from the outside can use different systems a model year apart, so the VIN removes the guesswork.
Related services
- Car Key ReplacementThe key snapped at the head while you were turning it in a stiff, frosty door lock.
- Key Fob ProgrammingA fob went missing weeks ago somewhere between a coat pocket and a parking lot, and a spare has covered the gap since.
- Transponder Key ProgrammingSince the remote starter was installed last month, the original key has started acting strangely, the car catches on the first turn some mornings and refuses outright on others.