What happens when you lose or break your key fob
A broken or missing key fob means you cannot unlock or start your car remotely, and you may not be able to open it at all if you do not have a physical key blade. You have three main routes: get a replacement from your car's dealership, buy an aftermarket fob and program it yourself, or hire a locksmith. The route you choose depends on your car's age, how much you want to spend, and whether you have the physical key blade as a backup.
The dealership is the most expensive option but the most straightforward — they have your car's records and can order the exact fob your vehicle needs. A locksmith costs less and can often come to you. Aftermarket fobs are the cheapest but require you to program the fob yourself, and not all cars support this.
Key Takeaways
- Dealerships charge $200 to $500 per fob but may provide compatibility and can order replacements even if you have no key blade.
- Locksmiths typically charge $100 to $300 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, and many newer cars do not support self-programming.
- If you have the physical key blade, you can unlock and start your car manually while you arrange a replacement fob.
- Calling your dealership first tells you whether your car supports aftermarket fobs and what the exact cost will be.
Getting a replacement from your dealership
The dealership has your vehicle identification number (VIN) on file and can order a fob that is may provide to work with your specific car. You will need to prove ownership — bring your driver's license and vehicle registration. The dealership will order the fob, program it to your car, and test it before you leave.
Cost ranges from $200 to $500 depending on your car's make and model. Luxury brands and newer vehicles with advanced security features cost more. The dealership may also charge a programming fee on top of the fob itself. Turnaround time is usually one to three business days if they have the fob in stock, or up to two weeks if they need to order it.
You do not need to have your old fob or the physical key blade to get a replacement from the dealership. If you have lost both, the dealership can still help you, though they may charge extra to verify your identity and ownership.
Using a locksmith for faster service
A locksmith can program a new fob while you wait, often in under an hour. Many locksmiths will come to your home or workplace, which saves you a trip to the dealership. Costs typically range from $100 to $300 depending on your car's make and model and your location.
Not all locksmiths work on all car brands. Before you call, have your car's year, make, and model ready. Ask the locksmith whether they have worked on your specific vehicle before. Some locksmiths specialize in certain brands — a locksmith who works on Fords may not work on Hondas.
Bring your driver's license and vehicle registration to prove ownership. Some locksmiths will ask to see your vehicle identification number (VIN), which is printed on your registration and also visible on the dashboard through the windshield on the driver's side. If you have the physical key blade, bring it — it helps the locksmith confirm they are programming the right fob.
Buying and programming an aftermarket fob yourself
Aftermarket fobs are universal fobs sold online or at auto parts stores for $20 to $100. They work on many cars, but not all. Before you buy one, check whether your car supports self-programming by searching online for your car's year, make, and model plus "self-program key fob" or "DIY fob programming".
If your car supports self-programming, the process usually involves sitting in the driver's seat with the doors closed, turning the key to the "On" position without starting the engine, and pressing buttons on the fob in a specific sequence. The exact steps vary by car — some require you to turn the key back and forth between "Off" and "On" a certain number of times, others require you to hold down a button on the fob itself. You will find the exact sequence in your car's owner's manual or on YouTube videos for your specific model.
Many newer cars, especially those made after 2010, do not support self-programming and require a dealership or locksmith to program the fob. If you buy an aftermarket fob and your car does not support self-programming, you will still need to pay a locksmith or dealership to program it, which defeats the cost savings.
What to do if you have no key blade
If your fob is broken but you still have the physical key blade, you can unlock your car and start it manually while you arrange a replacement fob. The key blade is usually hidden inside the fob — look for a small slot or button on the fob's edge and pull or pry it out gently.
If you have lost both the fob and the key blade, you cannot start your car without a replacement fob. Call your dealership or a locksmith right away. Do not try to hotwire the car — modern cars have anti-theft systems that will prevent the engine from starting without the correct key or fob.
Comparing cost and time for each option
| Option | Cost | Time to get fob | Best for |
|---|---|---|---|
| Dealership | $200–$500 | 1–14 days | Newer cars, luxury brands, may provide compatibility |
| Locksmith | $100–$300 | Same day or next day | Speed, convenience, mid-range budgets |
| Aftermarket fob (self-programmed) | $20–$100 | 1–2 days (shipping) | Older cars that support self-programming, tight budgets |
| Aftermarket fob (locksmith programs) | $120–$400 | 1–2 days plus programming | Rarely the best choice — usually more expensive than locksmith alone |
Steps to take right now
First, check whether you have the physical key blade. If you do, you can unlock and start your car manually, which gives you time to research your options without rushing.
Second, gather your car's information: the year, make, model, and VIN. Your VIN is on your registration and on the dashboard. Call your dealership and ask three things: the exact cost of a replacement fob, how long it takes to arrive, and whether your car supports aftermarket fobs that you can program yourself.
Third, search online for locksmiths in your area who work on your car brand. Read reviews and call at least two to compare prices and availability. Ask whether they can come to you or whether you need to go to their shop.
Fourth, decide which option fits your budget and timeline. If you need the fob today and have a tight budget, a locksmith is usually the best choice. If you can wait and want the lowest cost and your car is older, an aftermarket fob may work. If you want certainty and do not mind paying more, the dealership is the safest bet.
Frequently Asked Questions
Can I start my car with just the physical key blade if the fob is broken?
Yes. The key blade can unlock the door and start the engine on most cars. You will lose remote locking and unlocking, but the car is still drivable. Extract the blade by looking for a small slot or button on the fob's edge and pulling gently.
Will an aftermarket fob work on my car?
It depends on your car's year and make. Older cars (pre-2010) often support aftermarket fobs. Newer cars and luxury brands usually do not. Search online for your car's year, make, and model plus "aftermarket key fob" to find out, or call your dealership and ask.
How long does it take a locksmith to program a fob?
Usually 30 minutes to an hour. Some locksmiths can do it while you wait. Others may need to order the fob first, which adds one to three days. Call ahead and ask whether they have the fob in stock for your car.
What if I lose my fob again — can I get a spare made?
Yes. Once you have one working fob, a dealership or locksmith can program additional fobs to your car. This is usually cheaper than replacing a lost fob because they already have your car's security codes on file. Expect to pay $100 to $300 per additional fob.
Do I need my old fob to get a new one?
No. The dealership can order a new fob using your VIN and vehicle registration alone. A locksmith can also program a new fob without the old one, though having it can speed up the process.