What happens when your key fob stops working or goes missing
A broken or lost key fob means you cannot unlock or start your car remotely, and you may not be able to open it at all if the physical key inside is also gone. You have three main routes: get a replacement from your car's manufacturer (the dealership), buy an aftermarket fob and program it yourself, or hire a locksmith to do both. Each costs different amounts, takes different time, and works differently depending on your car's year and model.
The dealership is the most expensive but most reliable option. A locksmith is usually faster and cheaper. Aftermarket fobs are the cheapest upfront but require you to program the fob yourself, which works on some cars and not others. Your choice depends on your budget, how quickly you need the car, and whether your vehicle supports DIY programming.
Key Takeaways
- Dealerships charge $200 to $500 per fob but may provide compatibility and can order replacements for any car model.
- Locksmiths typically charge $100 to $250 and can program fobs on-site, but not all locksmiths work on all car brands.
- Aftermarket fobs cost $20 to $100 but require you to program them yourself, a process that works on many cars made after 2000 but not all.
- You will need proof of ownership (registration or title) and your Vehicle Identification Number (VIN) for any replacement route.
- Some cars let you program a new fob using only the car itself and a few button presses; others require specialized equipment only dealerships and locksmiths have.
Getting a replacement from the dealership
The dealership is your car manufacturer's official source for key fobs. You bring your car and proof of ownership (registration or title), and they order or have in stock a fob programmed specifically for your vehicle. The fob arrives coded to your car's security system, so it works when ready once you pay.
Dealership fobs cost between $200 and $500 depending on your car's make and model. Luxury brands and newer cars with advanced security features cost more. The dealership also charges a programming fee, usually $50 to $100, though this is sometimes included in the fob price. Total time is usually one to three days if they have stock, or one to two weeks if they must order from the manufacturer.
The main advantage is certainty: the dealership knows exactly what your car needs and will not sell you an incompatible fob. The main disadvantage is cost and wait time. If your car is old or uncommon, the dealership may have trouble finding a replacement fob at all, though this is rare.
Using a locksmith to replace and program a fob
A locksmith who specializes in automotive work can order a fob, program it to your car, and hand it to you in one visit. You call, describe your car (year, make, model), and they either have a compatible fob in stock or order one. Once it arrives, they program it using specialized equipment and test it before you leave.
Locksmiths typically charge $100 to $250 total, including the fob and programming. This is significantly cheaper than a dealership. The catch is that not all locksmiths work on all car brands — some specialize in domestic cars, others in imports, and some in luxury vehicles only. Before you call, search online for "automotive locksmith near me" and check their reviews to confirm they work on your car's brand.
Locksmiths are usually faster than dealerships because they keep common fobs in stock and can program on-site. Turnaround is often same-day or next-day. The trade-off is less certainty: a locksmith may order the wrong fob if they misunderstand your car's year or trim level, though reputable locksmiths will confirm details before ordering.
Buying an aftermarket fob and programming it yourself
An aftermarket fob is a replacement made by a third party, not your car's manufacturer. You can buy one online or at an auto parts store for $20 to $100, depending on the brand and features. You then program it to your car yourself using a process that varies by manufacturer.
Self-programming works on many cars made after 2000, but not all. Some manufacturers allow you to program a new fob by sitting in the driver's seat, turning the key in the ignition a specific number of times, and pressing buttons on the fob in a set sequence. Other manufacturers require a specialized device called a programmer, which you must buy separately (usually $50 to $200) or rent. A few manufacturers do not allow DIY programming at all and require a dealership or locksmith.
Before you buy an aftermarket fob, search online for "[your car year, make, model] DIY fob programming" to find out whether your car supports it. If it does, the instructions are usually available free on YouTube or the fob seller's website. If your car does not support DIY programming, you will have wasted money and still need to pay a locksmith or dealership.
The advantage of aftermarket fobs is low upfront cost. The disadvantage is the risk of buying an incompatible fob, the time spent researching and programming, and the possibility that programming will fail and you will need to call a professional anyway.
What you need to bring or provide for any replacement
Regardless of which route you choose, you will need to prove you own the car. Bring your vehicle registration, title, or insurance card. You will also need your Vehicle Identification Number (VIN), which is printed on your registration and on a sticker inside the driver's door frame. The VIN tells the dealership or locksmith exactly which fob your car needs.
If you are ordering online, have your VIN and a photo of your registration ready. If you are visiting in person, bring the physical documents. Some dealerships and locksmiths will ask for a photo ID as well to confirm you are the registered owner.
Comparing cost and time across the three routes
| Route | Typical Cost | Typical Time | Best For |
|---|---|---|---|
| Dealership | $200–$500 | 1–14 days | Rare or luxury cars; may provide compatibility |
| Locksmith | $100–$250 | Same-day to 2 days | Common cars; need it fast; want to save money |
| Aftermarket + DIY | $20–$300 | 2–7 days (shipping) + 30 minutes (programming) | Budget-conscious; comfortable with technology; car supports DIY programming |
What to do if you have lost your only key fob
If your only fob is gone and you have no spare, you can still start your car using the physical key hidden inside most fobs. Open the fob by prying the two halves apart (usually with a coin or flathead screwdriver), and you will find a small metal key. Use this key to unlock the driver's door and start the car manually by inserting it into the ignition.
This is a temporary solution only. You should order a replacement fob as soon as possible because the physical key is slow and inconvenient, and some newer cars do not have a physical key at all. Once you have a replacement fob, you can reprogram your spare (if you have one) or order additional spares to avoid this situation again.
If you have lost your fob and suspect someone else has it, consider having your car's locks rekeyed by a locksmith. This costs $100 to $200 but ensures that the lost fob will no longer work, protecting your car from theft.
Frequently Asked Questions
Can I program a fob I bought online myself, or do I need a professional?
It depends on your car. Many cars made after 2000 allow DIY programming using a sequence of key turns and button presses. Search "[your car year, make, model] program fob yourself" to find out. If your car does not support it, you will need a locksmith or dealership.
What if I buy an aftermarket fob and it does not work?
Most reputable sellers offer returns within 30 days if the fob is incompatible. Check the return policy before you buy. If you have already tried to program it and it failed, you can still return it and buy from a locksmith instead, though you will have lost time.
How much does it cost to replace a fob if my car is still under warranty?
Warranty coverage for key fobs varies by manufacturer and warranty type. Some cover fobs as part of the basic warranty; others do not. Contact your dealership with your warranty documents to ask. Even if the fob is not covered, the dealership can still replace it at the standard cost.
Can a locksmith program a fob for any car brand?
No. Locksmiths specialize by brand or type. Some work on domestic cars only, others on imports, and some on luxury brands. Call ahead and describe your car to confirm they can help before you visit.
What if my car is very old and the dealership says they cannot find a replacement fob?
Call a locksmith who specializes in older vehicles. They often have access to universal fobs or can source discontinued fobs from specialty suppliers. This may cost more than a standard replacement but is usually still cheaper than a dealership.