Car keys · London
Spare Car Key Duplication
The proximity fob has ridden in a pocket for years, the range feels shorter than it used to, and a dashboard warning mentioned a battery a while back. Nobody has sorted out what happens on the day it finally goes dark.
Spare Car Key Duplication
In plain words
Households with more than one driver and one car key end up trading it back and forth, which works until two people need the vehicle at once. Making a second key from the original lets each driver carry their own, cut from the same blade profile and carrying the same chip or code the immobilizer recognizes, so neither key behaves differently from the other. The locksmith tests both apart from each other in the doors and the ignition before handing them back, and a family running two vehicles on the same lock family can sometimes be brought onto one key altogether.
How the visit goesThe blade on the everyday key has gone shiny and thin along one edge, and lately it needs a wiggle before the ignition catches. Nobody wants to be holding a failing original with nothing waiting in reserve if it finally gives out.
London
How the visit goes
Locating the right blank
A correct spare starts with the correct blank: the same blade profile as the original, and where relevant the same shell shape for a remote head or proximity fob so the buttons and battery compartment line up. Aftermarket blanks exist for most common platforms, while a less common or very recent model sometimes calls for a shell sourced specifically for that vehicle. Getting this step right avoids a mismatch discovered only after cutting has begun, and it is one of the reasons the vehicle's year, make and model are confirmed early rather than assumed from the look of the current key.
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.
A record worth keeping
A short note of how many keys exist for the vehicle, what each one can do, and who holds it is a small thing to write down and a genuinely useful one to have later, whether that later is a private sale, an insurance question, or simply working out which key someone borrowed and forgot to return. This record also makes any future visit faster to start, since a returning locksmith or a different one entirely can begin from a known baseline instead of counting keys from scratch.
Spare Car Key Duplication
In the van
- Remote-head key shell
- Code-cutting machine
- Transponder chip
- Chip cloning tool
- Key blank matched to blade profile
What affects the quote
Same fees day, night or weekend
1Matching two vehicles to one key
Bringing a second vehicle onto the same key, when the two lock systems are compatible, takes more identification and testing than producing a spare for a single car alone.
2Aftermarket 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.
3Reprogramming to drop a missing key
When a key is genuinely unaccounted for, having the vehicle's system stop recognizing it is separate work from cutting a new spare, and is scoped as its own step when it is needed.
Spare Car Key Duplication: questions
What if the fob's battery is already low?
A low battery in the original does not stop a spare from being made, since the chip and code stored inside still respond during programming even as the battery fades. It is worth mentioning the low battery when you call, though, since the new fob is a natural moment to have a fresh battery on hand for both keys and to note which type each one takes.
Can a spare be made from a key that is already worn?
Yes, and it is often a good reason to make one. Rather than tracing every rounded edge of a worn blade onto the new copy, the locksmith can decode the lock or cut to a valid factory code for the blade, then read or clone the chip data separately for the electronics, producing a spare that is cleaner than the original rather than a copy of its wear. The worn key can then be compared against the fresh one and retired if it is due for that.
Can one key work for two vehicles?
Sometimes, when both vehicles share a compatible lock family and immobilizer system, most often two vehicles from the same manufacturer and a similar era. Sharing a keyway is not enough on its own: the two locks also need a bitting that satisfies both, or one vehicle's cylinders get rekeyed to match, and the transponder has to be capable of authorization on both immobilizers. Where they do not line up, the practical answer is two separate keys carried together on one ring.
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Spare Car Key Duplication near you
Homes and businesses in London tend to need the same handful of things from a locksmith, so that is how the list is arranged: emergency openings, changing or rekeying locks, stronger hardware for people who want it, commercial doors and access, and safes. Car keys sit at the end for the households that need them.