Lost All Car Keys in San Diego? What Happens Next

Losing the only key to your car feels like a dead end. It is not. For most cars, a mobile locksmith can make a new key from scratch, at the car, in a single visit. Here is how it works and what you can do now to make it quick.

First, which kind of key did you lose?

Cars use three broad types of key.

Basic metal key

Found on older cars, mostly built before the late 1990s. It is a cut blade with no electronics. A new one is cut to the lock or to the factory key code.

Transponder key

Standard on most cars built since the early 2000s. A small chip sits inside the plastic head. When you turn the key, the car’s immobilizer looks for that chip. If it does not find a match, the engine cranks but will not start. A replacement has to be cut and then programmed to the car. See transponder keys.

Smart key or fob

Used with push-button start and keyless entry. The car senses the fob nearby and lets you unlock and start without touching a key. Most smart fobs still hide a mechanical blade inside for the door. A replacement needs programming, and the emergency blade needs cutting.

Not sure which you had? Look at the car. Push-button start means a smart key. A car built since the early 2000s with a metal key that has a thick plastic head usually has a transponder key, with a few exceptions such as some Hyundai and Kia models before 2021.

Why the car has to be there

A transponder or smart key is paired to your car’s immobilizer through the diagnostic port under the dash. That pairing cannot happen without the car. A key that has been cut but not programmed will open the door and nothing else.

We bring the cutting machine and the programming equipment to the car, whether it is parked at Liberty Station, on a street in North Park, or in a garage near Petco Park.

What we need from you

Have these ready when you call or text.

• Year, make and model.
• The VIN. It is on the plate at the base of the windshield on the driver’s side, on the door jamb sticker, and on your registration and insurance card.
• Proof of ownership. Registration, title, or an insurance card in your name.
• Photo ID that matches.
• Where the car is and whether we can reach it.
• Whether the keys were lost or stolen.

We ask for ID and proof of ownership on every key job. A car key is made for one vehicle, and we confirm it is yours before we begin. You get the price before any work starts.

If your keys were stolen

When we program a new key on most cars, we can also erase the keys the car already knows. After that, the stolen key will not start the engine. If it had remote buttons, those stop working too.

One caveat. If the stolen key had a metal blade, the blade will still open the door. The car cannot be driven, which matters most, but tell us it was a theft when you call so we can talk through options.

It is also worth filing a police report. Insurers often ask for the report number.

Dealer or mobile locksmith, in practical terms

A dealer can make your key. The catch is that dealers usually need the car brought to them. With no key, that means a tow. Many dealers also order keys rather than stock them, so the car may sit for days. A mobile locksmith comes to the car and does the cutting and programming in one visit.

The dealer is still the right choice in a few cases: some newer European luxury models, and any situation where a warranty or recall covers the key. When you call, we tell you plainly if your car is one we cannot do.

Make a spare while we are there

When every key is gone, the first key carries most of the work. A second key made in the same visit adds very little time.

More important, once the car has a working key, adding another later is a simpler job on most models. With zero keys, you are back to an all-keys-lost job. Keep the spare at home, not in the glovebox. Details on spare keys.

What the visit looks like

1. We check your ID and proof of ownership.
2. We confirm the price.
3. If the car is locked, we open it without damage.
4. We cut the new key to code or to the lock.
5. We program the key and erase any lost or stolen keys if you ask.
6. We test the engine, the doors, the trunk and the remote buttons.

If you have lost every key, call or text (619) 313-6749 any day between 7:30 AM and 10:30 PM. Our car key replacement covers most makes and models across our service area.