What does key fob replacement actually involve?
A key fob is a small computer that happens to open your car. Inside is a radio transmitter, a battery, and usually a chip that your vehicle's computer has to recognize before it lets the engine run. That is why replacing one is not like cutting a house key at a hardware counter. The new fob has to be the right hardware for your vehicle, and then it has to be introduced to the car through programming. Skip either step and you are holding a nice piece of plastic that does nothing.
Most people who call us about key fob replacement are in one of a few situations. The fob was lost. It was dropped, soaked, or sat on, and quit. The buttons wore through, the case cracked, or a fresh battery did not bring it back. Some people still have a working fob and want a spare key fob made before the problem gets worse. Each case is handled a little differently, so the first thing we ask is whether you still have any working key at all.
This page is about fobs: remotes, smart keys, and push-button-start keys. If your key is a plain chip key with no buttons, our transponder key programming page is the better fit. If every key to the vehicle is gone, start with lost car key replacement, because that job has extra steps.
Remote, smart key, or push-button start: which fob do you have?
The names get tossed around loosely, and you do not need to know the right term to call us. Still, it helps to know roughly which kind you are holding, because it changes the work.
Naming tends to blur in daily use. When people search for push to start key replacement, push button start key replacement, or proximity key replacement, they are almost always describing the same thing: a key the car detects nearby, with a button on the dash to start the engine. In practice we treat those as one job.
Smart keys are where details vary the most from one make and model year to the next. Some are straightforward to add. Others need extra security steps, and a few can only be done through the dealer. We do not guess from the phone call. We confirm by VIN, and sometimes in person, before we tell you what is possible.
- Remote key (blade plus buttons): a metal key blade with lock, unlock, and trunk buttons built in or attached. The blade is cut and the remote is programmed to the car.
- Flip or switchblade key: the same idea, with the blade folding into the fob. The blade still has to be cut and the electronics still have to be programmed.
- Smart key or proximity key: stays in your pocket or bag, and the car senses it. Most have a hidden emergency blade inside, but the car will not start without the fob being recognized.
- Push-button-start fob: the same family as proximity keys. The start button replaces the ignition cylinder, and the fob is the only thing that authorizes it.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366How does mobile key fob programming work?
Mobile key fob programming means the work happens where your car is parked. Our vans carry the diagnostic tools, key blanks, and fob hardware to do it on site. Here is the sequence we follow.
- You call (213) 577-1366 and tell us the year, make, and model, what kind of key you have, and whether any working key is left.
- We work out what your vehicle uses. When the model year or trim could change the answer, we ask for the VIN, which is visible on the dash through the windshield and printed on your registration.
- We ask for proof that the vehicle is yours, typically registration or title plus your ID. This protects you as much as anyone, since a fob is the whole key to the car.
- A technician drives the van to your location, whether that is a driveway, a street, or a parking lot.
- If the fob has a blade, we cut it. Then we connect to the vehicle and program the new fob so the car recognizes it. Where the vehicle allows it, we can also remove a lost fob from the car's memory so it no longer works.
- We test everything before we are done: lock, unlock, trunk or hatch, panic button, remote start if the car has it, and starting the engine more than once. You leave with a fob that works, not one that mostly works.
When is the dealer the only option?
Honesty matters here, because nobody wants to wait for a van only to be told it cannot be done. Some vehicles are locked down by the manufacturer. Certain makes and model years require authorization or codes that are only available through the dealer, or use fobs that are ordered by VIN and cannot be programmed with outside equipment. When that is your car, we will say so on the phone instead of letting you pay for a visit that ends in a referral.
The reverse is also true. Many people assume the dealer is the only route when it is not. A locksmith who comes to the car can often handle a fob that would otherwise mean arranging a tow. We can usually tell you which situation you are in once we have the VIN. Where the data is unclear for a particular vehicle, we say that plainly and confirm in person rather than promising something we cannot verify.
Sometimes the fob itself is fine. A worn-out battery, a cracked shell, or a dirty contact can mimic a dead fob. If a repair or a simple battery swap will do, we will tell you that instead of selling a replacement.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366What affects the cost of key fob replacement?
We do not quote prices on a web page, because the honest answer depends on your vehicle. What we can do is tell you exactly what moves the number, so the quote you get on the phone makes sense.
Once we know your vehicle, we give you the quote before work begins. If there is a lighter-cost option, such as swapping a worn shell onto a working fob or adding a spare while you still have a good key, we will point it out. For many people, having a technician come to the car is also the more economical route, since it avoids the cost and hassle of a tow.
- The type of fob: a basic remote costs less to replace than a smart key with proximity features, and push-button-start systems involve more security steps.
- Make, model, and year: some manufacturers make programming simple, others require extra equipment or authorization.
- Whether you have a working key: adding a fob while one still works is usually simpler than starting from zero after every key is lost.
- Blade cutting: fobs with an emergency or flip blade need that blade cut and checked.
- How many fobs you need: programming two at once is generally more efficient than coming back later for a second.
- Hardware choice: original-manufacturer fobs and quality aftermarket ones are not always priced alike, and not every vehicle accepts both.
- Time and location: after-hours calls and longer drives take more of a technician's time than a daytime visit nearby.
Why get a spare key fob before you lose the last one?
Most fob emergencies start with a single point of failure: one fob, and it is gone. When you still have a working fob, adding another is a calmer, more predictable job. We have the original to work from, and you are not stranded while it happens.
A spare key fob is worth thinking about if you only own one, if your fob is visibly worn, or if a battery change no longer fixes intermittent behavior. Keep the spare somewhere other than the bag or pocket that holds your main fob. A spare in the same keyring does nothing when the keyring is lost.
If you do get locked out with a fob inside the vehicle, that is a different problem. Our car lockout page covers it. And if a new fob is programmed but the car still will not start or the key will not turn, the cause may be mechanical rather than electronic. That is where ignition repair comes in.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Key fob replacement around San Marino: Lacy Park, Huntington Drive, and Mission Street
San Marino is almost entirely single-family homes on large lots, many built in the 1920s and 1930s. In practice, that means most cars here live in driveways, behind gates, or in garages, rather than in shared parking structures. For fob work, that is convenient. We bring the van to your property and do the programming right where the car sits, whether you are on the estate streets around Lacy Park, along the Huntington Drive corridor, or near the Huntington Library area.
Large fenced lots along Huntington Drive often have gates and side doors between the street and the driveway. If your fob is dead and the car is parked behind a gate, tell us when you call so we know how access works before we arrive. If you are in the Mission District and a fob quits during a workday near the Mission Street business district, we can come to the lot or curb where the car is parked. The same goes for the Oak Knoll border area near Pasadena and the El Molino Viejo area. All of it falls within ZIP code 91108.
Our storefront is at 10740 Wilshire Blvd in Westwood, about 22 miles from San Marino, and the mobile vans are what make the trip. Calls are answered at (213) 577-1366 around the clock, so a dead fob at night or on a weekend is not a problem to schedule around.
The area also has homes with original mortise locksets and period hardware. That is its own specialty, and this page does not cover it. If you are dealing with both a car key and an older front door, tell us, and we will plan the visits accordingly. For a broader view of what we do for vehicles, see our automotive locksmith page.
Why call Wilshire Lock & Key for a key fob?
Wilshire Lock & Key has been in business since 1987. When you call, you reach us, not a national call center that sells your job to whoever picks it up. The company that answers the phone is the company that sends the van.
California requires locksmith companies to hold a license from the Bureau of Security and Investigative Services (BSIS), called an LCO license. Ask any locksmith for that license number before they start work, including us. It is a fair question and a reasonable way to screen out operators who are not legitimate.
- In business since 1987, with a storefront at 10740 Wilshire Blvd in Westwood plus mobile service vans.
- One company, no dispatch middlemen. The person you talk to is connected to the person who does the work.
- David, the owner and lead technician, oversees the work, so there is someone accountable for how it is done.
- Phone answered 24 hours a day, 7 days a week, year-round, at (213) 577-1366.
- Straight answers about dealer-only cases and about when a repair beats a replacement.
- Coverage of 140 cities across Los Angeles and Ventura counties, so we know how to work a van across a wide area. For vehicle service in your area, mobile locksmith explains how it works.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366What should you have ready when you call?
A few details speed up the call and let us give you a more accurate answer. None of them is required to get started, but each helps.
- Year, make, model, and trim of the vehicle.
- The VIN, which is on the dash near the windshield and on your registration.
- What kind of key it is: blade with buttons, flip key, or push-button-start fob.
- Whether you have any working key or fob left, and how many you want when we are done.
- Where the car is parked, and whether there is a gate, a code, or a garage involved.
- Your registration or title and your ID, ready for when the technician arrives.
Frequently asked questions
How much does key fob replacement cost in San Marino?
It depends on your vehicle, so we do not post a flat figure. The main factors are the fob type, make and model year, whether you still have a working key, whether a blade needs cutting, and how many fobs you want. Call (213) 577-1366 with your vehicle details, and we will explain the quote before any work starts.
Can you program a key fob if I lost all my keys?
Often yes, but it is a bigger job than adding a spare. With no working key, we have to authorize a new one through the vehicle's computer, and some makes make that harder. We confirm by VIN whether it can be done on site or needs the dealer.
Will I have to go to the dealer?
Not always. Many fobs can be replaced and programmed by a mobile locksmith at your car. Some vehicles, though, restrict programming to the dealer. We tell you which situation you are in once we have the VIN, and we say so plainly if it is dealer-only.
Can you come to me at night or on a weekend?
Yes. Our phone is answered 24 hours a day, 7 days a week, all year, and our vans serve San Marino and the 91108 area. Call (213) 577-1366 and tell us where the car is parked so we can plan the visit.
Is a key fob the same as a transponder key?
Not exactly. A transponder key has a chip that lets the engine start, but it may not have buttons. A fob adds remote functions, and smart fobs add proximity entry and push-button start. Many fobs include a transponder chip inside, so the two overlap, but the programming steps can differ.
My fob stopped working. Do I need a new one?
Not necessarily. A weak battery, worn contacts, or a cracked case can cause the same symptoms. If the fob is still recognized by the car, a repair or battery swap may be all you need. If the electronics have failed or the fob was lost, replacement and programming is the right route.
Can I buy a fob online and have you program it?
Sometimes, but it is a gamble. Online fobs may be the wrong frequency, locked to another vehicle, or poorly made, and not every one can be reused. We would rather check your vehicle before you buy anything, and we will tell you what we can and cannot program.
What do you need to prove I own the car?
We ask for the vehicle registration or title and a matching photo ID. A fob is the full key to the car, so we verify ownership every time. If you are missing some of that paperwork, call us and we will explain what alternatives might work.
Will my old fob still work after you program a new one?
It depends on the vehicle. If you lost the old fob, we can often remove it from the car's memory so anyone who finds it cannot use it. If the old fob still works, it can usually stay programmed alongside the new one. We will tell you what your car allows.
More locksmith help in San Marino
Key Fob Replacement near San Marino
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.
