What counts as a key fob replacement?
People use "key fob" to mean a few different things, and the difference matters because it changes what we bring and what we do. Some cars use a remote head key: a metal blade you turn in the ignition, with lock and unlock buttons built into the same piece. Others use a separate remote that rides on a ring next to a plain key. Newer cars use a proximity key, also called a smart key, which stays in your pocket and lets you unlock the door and press a button to start the engine.
All of these fall under key fob replacement, and all of them need to be paired with your specific car. A fob that is cut or built correctly but not programmed is just a piece of plastic. The programming step is the real work, and it is why a hardware store or an online listing can't finish the job on its own.
- Remote head keys, where the blade and the remote are one piece
- Standalone remotes and flip keys for locking, unlocking, and trunk release
- Proximity or smart keys for push to start and push button start cars
- Spare key fobs added to an existing set, so you aren't one loss away from a bad day
What happens when a key fob is lost, dead, or broken in Walnut?
The situations are usually one of four. The fob is lost and you have no other key. The fob still exists but the buttons are worn through or the case has cracked. The fob works only some of the time and the car shows a key-not-detected message. Or you have one working fob and you want a second before the first one disappears.
Each of those has a different best answer. A dead battery in a smart key is not a replacement job at all, and we would rather tell you that on the phone than send a van. A cracked case can sometimes be moved over to a new shell. A fully lost key with no spare means the car must be programmed to accept a new one, which takes more equipment and more care than adding a second fob to a car that already has a working key.
If you are locked out of the car right now with the key inside or missing, that is a related but separate problem. Our car lockout service in Walnut gets you back in the vehicle first, and the fob work follows from there.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366How we replace and program a key fob, step by step
Here is how a typical call goes. The details shift by make and model, but the order stays the same.
- You call (213) 577-1366 and tell us the make, model, and year, plus whether you have any working key left. We answer around the clock, so late-night calls are normal for us.
- We ask about the type of key you have now: turn-key with buttons, flip key, or push-to-start. If you can read us the VIN from the dashboard or the door jamb sticker, we use it to confirm the right fob and the right procedure.
- We tell you plainly whether your car can be handled in the field or whether it falls into dealer-only territory. More on that below.
- A mobile van comes to the car. We check ownership and ID before cutting or programming anything, because making a key for a car is exactly the kind of work that should require proof.
- We cut the blade if the fob has an emergency key, then program the new fob to the vehicle. On many cars this also means adding the key's security code to the car's computer, which is separate from the remote buttons.
- We test everything before we leave: lock, unlock, trunk, panic if equipped, and starting the engine. For smart keys, we check that the car detects the fob from inside the cabin and at the door.
- If you have other old fobs, we can remove lost ones from the car's memory on models that support it, so a key you lost can't be used to start your car.
Can every key fob be done on site, or are some dealer-only?
No, and anyone who says every car can be done by a locksmith is not being straight with you. Many vehicles can be handled in the field. Some cannot, or cannot without the dealer's involvement, usually because the manufacturer locks the key-code data behind its own system or because a particular model needs a factory procedure.
We don't guess about this. Fob types, frequencies, and programming methods vary a lot between makes and even between model years of the same car, and sources for particular models sometimes conflict. So we confirm by VIN and, when needed, in person before we promise you an outcome. If your vehicle turns out to be dealer-only, we will say so and not take your money for a job we can't finish.
If you want to understand how the security chip inside a key is handled, our page on transponder key programming covers it. Many fobs combine a chip with the remote, so the two services overlap. For a broader look at cutting and making keys for a car with no working key, see car key replacement.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366How much does key fob replacement cost in Walnut?
We don't quote a number in a web page, because a fair price depends on your car, and a flat number would be wrong for most people reading it. Here is what moves the cost, so you can judge any quote you get from us or anyone else.
The lighter-cost route is usually adding a fob to a car that still has a working key, since the car can often be programmed with the existing key present. Starting from zero keys is generally more involved.
- The type of fob: a basic remote costs less to source than a proximity smart key, and some brands' fobs are simply more expensive parts.
- Whether you have a working key: a lost-all-keys situation requires more programming work than a spare.
- Make, model, and year: some systems are straightforward, others need specialized equipment or extra security steps.
- Whether the fob includes an emergency blade that needs to be cut.
- Time of day and location: a night call or a drive out to your address takes more of our time than a daytime visit.
- Whether a used or aftermarket fob is workable, or the car needs an original part to program reliably.
Why call Wilshire Lock & Key for a car key fob?
We have been in business since 1987. That is long enough to have watched car keys go from simple cut metal to coded chips to push-button smart keys, and to have learned the habits of each generation.
We are one company, with a storefront at 10740 Wilshire Blvd in Westwood and mobile service vans. When you call, you reach us, not a call center that sells your job to whoever picks it up. That matters with car keys, because a middleman can't tell you honestly what will or won't work on your vehicle.
David is the owner and lead technician, and the work is held to his standard. He would rather talk you out of an unnecessary replacement than sell you a fob you don't need. We serve 140 cities across Los Angeles and Ventura counties, and Walnut is one of them. If you want a general sense of what we do on the road, read about our mobile locksmith service.
Key fob replacement around Walnut: Mt. SAC, hillside tracts, and the corridors
Walnut is mostly single-family tracts built from the 1970s through the 1990s on hillside lots, with many HOA communities. That shapes how car key calls happen here. Cars are often parked in driveways or garages up in places like the Snow Creek area, Lemon Creek area, and Walnut Hills, and a fob that goes missing can be tracked back to a house, a school bag, or a park visit. Our van comes to the driveway, which saves you the trip. If you are in an HOA community, tell us about gate or guest-parking rules when you call so we can plan access.
The Mt. SAC campus area is its own situation. Students in 91789 often have one key for a car they share with family, and a lost fob in the middle of a school week is a real problem. Student vehicle lockouts and key replacement around campus are something we handle regularly, and we can program a spare so the family is not down to one fob afterward.
The Amar Road and Grand Avenue corridors and the northern edge of Valley Boulevard are where people park at work or errands. If you misplace a smart key while shopping or at a job, call us from there. We confirm the car and your ID with you in the lot, and then do the programming where the car sits.
Walnut summers are hot, typical of the eastern San Gabriel Valley. We don't need to blame the heat for every fob problem, but a worn case and sticky buttons that have been through a lot of daily use are worth replacing before they fail altogether. Walnut is about 39 miles from our Westwood base, which is why the mobile van, not a trip to the shop, is the normal way we serve you. You can see our other Walnut services at our Walnut locksmith page.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366How to avoid losing your last working key fob
The best time to get a spare key fob is before you need one. If you have two working fobs, a lost one is an inconvenience. If you have one, it is an emergency, and emergencies cost more in time and money. We see this pattern constantly, and it is avoidable.
A few habits help. Keep your second fob somewhere safe at home, not in the car. Don't leave a smart key inside the vehicle, because cars can sometimes be driven away or locked with it inside. And if a fob starts to act up, call before it quits. A weak signal or intermittent start is a warning, and a battery swap may fix it.
If you lose a fob, don't assume it is gone. Check pockets, backpacks, and the places you were most recently. If it really is gone, call us soon and ask about removing it from the car's memory on supported models, so no one else can start your car with it. If you have lost every key to your car, our lost car key replacement page explains what that process looks like.
What to check before you hire anyone for car key work
California requires locksmith companies to hold a license from the Bureau of Security and Investigative Services, called a BSIS LCO license. It is reasonable to ask any locksmith for that number before work begins, and that includes us. A real company will give it without argument.
Beyond that, a few things signal a trustworthy provider. They ask for your ID and proof of ownership. They are honest about whether your car is a field job or a dealer job. They tell you what affects the price before they start. And they have a real address you can find. If the person on the phone can't tell you where the company is based, be careful.
If your issue is more than the fob, such as a key that turns hard or an ignition that won't take any key, that may be a mechanical problem. Our ignition repair page covers it, and for the full range of vehicle work see our automotive locksmith overview. For help any hour of the day, our 24-hour locksmith service in Walnut is the same company and the same phone line.
Frequently asked questions
Can you program a key fob at my house in Walnut?
In most cases, yes. Our vans carry programming equipment, so we usually work at your car in the driveway, a parking lot, or wherever it is. If your vehicle is one that needs dealer involvement, we tell you that when we confirm the details by VIN, before anyone drives out.
What if I lost my only key fob?
It can still be done on many vehicles, though it takes more work than adding a spare because the car must be programmed to accept a new key from scratch. Call with the make, model, year, and VIN if you can. We will tell you what is possible and what to expect.
Do I need a new fob, or is it just the battery?
If the fob works at close range or the car shows a low-battery message, the battery is the first suspect. If the buttons do nothing even with a fresh battery, or the case is cracked, replacement is more likely. Describe the symptoms when you call and we will help you decide.
Do you replace push to start and push button start smart keys?
Yes, where the vehicle allows it. Proximity keys are paired to the car, and some makes need specific equipment. We confirm by VIN or in person first, and say so plainly if a particular model needs the dealer.
Is it more economical to go to the dealer or call a locksmith?
It depends on the car. A mobile locksmith is often the more economical route because there is no towing or waiting for an appointment, but for some models only the dealer can do the job. We tell you honestly which situation you are in.
Will you ask for proof that the car is mine?
Yes. We ask for ID and proof of ownership, such as registration, before making or programming a key. That protects you, and it is the standard any reputable locksmith should follow.
Can you add a spare key fob if I still have one that works?
Yes, and this is usually the simpler job. Having a working key often makes programming a second fob more straightforward. It is worth doing before the first fob is lost or fails.
What if my old fob is lost and I'm worried someone could use it?
On models that support it, we can clear lost fobs from the car's memory when we program the new one, so the old fob no longer starts the car. Ask us about this when you call, and we will tell you whether your vehicle supports it.
Can you help if I'm locked out and also need a new fob?
Yes. We usually get you into the vehicle first and then handle the fob, often in the same visit. For the lockout side, see our car lockout service, and call (213) 577-1366 to start either one.
More locksmith help in Walnut
Key Fob Replacement near Walnut
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.