The first thing to know is that a lost car key is rarely the emergency it feels like. Modern vehicles use coded transponder keys, and a properly equipped mobile auto locksmith can generate a brand-new key, program it to your car and delete the lost one from the vehicle's memory, all on your driveway. Here is exactly how to handle it.
Step one: stop and check the obvious
Before anything else, do a calm, methodical search. Keys turn up in coat pockets, between sofa cushions, in the door of the fridge and at the bottom of bags more often than you would believe. Retrace your last journey. If you genuinely had a spare, now is the time to confirm where it is, because having a spare changes everything about the cost.
Step two: work out what you are dealing with
Find out whether you have a spare key or not, as this is the single biggest factor in price and time.
- You have a spare. Use it to drive, then have a replacement cut and coded at your convenience. This is the cheapest and least stressful route.
- You have no spare at all. This is an "all keys lost" situation. It takes longer because the locksmith has to read the key information from the vehicle and start the coding process from scratch, but it is entirely routine.
- The key is locked inside the car. That is a lockout, not a lost key. The key can be retrieved by gaining non-destructive entry, which is usually quick and inexpensive.
Step three: choose dealer or mobile locksmith
Main dealers can supply keys, but it often means towing the car in, waiting days or weeks for the key to arrive, and paying a premium. A mobile auto locksmith comes to wherever the car is parked, carries the key blanks and programming equipment in the van, and usually completes the job the same day. For the great majority of mainstream makes and models, a specialist lost car keys service is faster and noticeably cheaper than the franchise.
What a good locksmith will actually do
When we attend an all-keys-lost job, the process is reassuringly thorough. We identify the vehicle and key type, generate the mechanical key by reading the lock or the vehicle data, then cut a fresh blade. We program the new transponder to the immobiliser and, crucially, delete the lost key from the car's memory so that whoever finds it cannot use it. You drive away with a working key and, often, a receipt suitable for an insurance claim.
What to have ready
- The vehicle's make, model and year, and ideally the registration.
- Proof that the car is yours, such as the V5C logbook and a matching ID.
- The exact location of the car, as we come to it rather than the other way round.
- An honest answer on whether any other key exists anywhere.
A word on prevention
Once you are sorted, get a spare cut straight away if you do not already have one. An all-keys-lost job is always more expensive than copying an existing key, so a spare tucked away safely at home is the cheapest insurance you can buy. If you ever lose your keys around Sutton or South London, send us the make, model and year on WhatsApp and we will tell you the price and timescale before we set off, with no surprises on arrival.