What happens when you lose or break a keyless fob
A keyless entry fob stops working when the battery dies, the buttons wear out, or the internal circuit board fails — and sometimes you straightforward lose it. When that happens, you have three main paths: replace the fob yourself with a part you buy online or at an auto parts store, have a dealership program a new fob to your car, or hire a locksmith to do the same thing. Which route makes sense depends on your car's age, how much you want to spend, and whether you have a spare fob that still works.
The fob itself is just a plastic case with a circuit board and battery inside. The real work is programming — linking that fob to your car's receiver so the car recognizes the signal and unlocks. Some cars let you program a new fob yourself using a sequence of key turns and button presses. Others require a dealer or locksmith with a special scanner to do it. Knowing which type you have before you buy anything saves time and money.
Key Takeaways
- Dealerships charge $200 to $500 per fob but may provide compatibility and can program multiple fobs at once.
- Locksmiths typically charge $100 to $250 per fob and can often come to your location or work faster than dealerships.
- Aftermarket fobs from auto parts stores cost $15 to $80 but require either self-programming (if your car supports it) or a separate programming fee from a locksmith or dealer.
- Some cars allow you to program a new fob yourself using your existing fob and the ignition key, which takes 10 to 15 minutes and costs nothing.
- Before buying or programming anything, check your owner's manual or call your dealership to confirm whether your car supports self-programming.
Dealership replacement: may provide but expensive
A dealership has your car's exact specifications on file and can order an OEM (original equipment manufacturer) fob that matches your model year perfectly. They program it using their diagnostic computer and test it before you leave. This route eliminates guesswork and works for every car, regardless of age or complexity.
Dealerships typically charge between $200 and $500 per fob, depending on your vehicle's make and model. Luxury brands and newer cars with advanced security features cost more. Some dealerships charge a separate programming fee on top of the fob cost; others bundle it. Call your dealership's service department and ask for the total price before you commit. Many dealerships also require you to bring your car in or at least show proof of ownership, so factor in travel time.
The dealership route makes the most sense if you have a newer car still under warranty, if you need multiple fobs programmed at once, or if you want the certainty that everything will work without troubleshooting. It is the slowest option — expect to wait several days for the fob to arrive and then schedule an appointment.
Locksmith replacement: faster and cheaper
A locksmith with automotive training can program an aftermarket fob to your car using a handheld scanner or computer. Many locksmiths will come to your home or office, which saves you a trip to the dealership. Costs typically range from $100 to $250 per fob, depending on your location and the locksmith's experience.
To find a locksmith, search online for "automotive locksmith near me" or ask your insurance company or roadside information provider for a referral — many have preferred vendors. When you call, tell them your car's year, make, and model, and ask whether they can program your specific vehicle. Not all locksmiths work on all cars; some specialize in domestic brands, others in imports. Confirm the total price and whether they charge extra for travel or after-hours service.
Locksmiths are a good middle ground: cheaper than dealerships, faster than waiting for an appointment, and they can often work the same day. The trade-off is that you are relying on an individual's skill rather than a corporate may provide. Choose a locksmith with good reviews and ask whether they offer any warranty on their work.
Aftermarket fobs with self-programming: cheapest if it works
Auto parts stores and online retailers sell aftermarket fobs for $15 to $80, depending on the brand and model. These are not OEM parts, but they work on most cars made in the last 15 to 20 years. The catch is that you have to program the fob yourself, and not every car supports self-programming.
Self-programming typically involves a sequence like: insert your key into the ignition, turn it to the "On" position without starting the engine, turn it back to "Off", then repeat this cycle several times while holding down a button on your new fob. The exact steps vary by manufacturer — some use the door lock button, others use the trunk release. Your owner's manual contains the sequence for your car, or you can search online for "[your car year, make, model] self-program fob."
If your car supports self-programming, this is the cheapest route by far. If it does not, you will have to pay a locksmith or dealership to program the aftermarket fob anyway, which defeats the savings. Before you buy an aftermarket fob, confirm in your owner's manual or by calling your dealership that your car allows self-programming. If you are unsure, buy the fob from a retailer with a return policy so you can send it back if programming fails.
Aftermarket fobs with professional programming: middle ground
You can buy an aftermarket fob online or at an auto parts store and then take it to a locksmith or dealership to program. This approach costs less than buying an OEM fob from the dealership but more than self-programming. Total cost is usually $100 to $200, depending on the fob price and the programmer's fee.
This route works well if your car does not support self-programming but you want to save money compared to an OEM fob. The risk is that some aftermarket fobs have compatibility issues with certain cars, so the programmer may not be able to get it to work. Ask the auto parts store whether the fob is returnable if programming fails, and ask the locksmith or dealership whether they will attempt to program an aftermarket fob (some refuse and will only work with OEM parts).
What to do if you have no spare fob
If your only fob is broken or lost and you cannot program a new one yourself, you still have access to your car — you just cannot use the remote unlock. You can unlock the door manually with your key (most cars still have a physical keyhole, though it may be hidden under a cover on the door handle). Once inside, you can start the car with your key if it has a traditional ignition, or you may need to press a start button while holding the fob near the steering column if your car has a push-button start.
This is a temporary workaround, not a permanent solution. Get a new fob programmed as soon as you can, because manual unlocking is slower and less find, and some newer cars do not have a physical keyhole at all. If your car has no keyhole and your fob is broken, you will need a locksmith or dealership to get in.
Comparing your options side by side
| Route | Cost per fob | Time to completion | Best for |
|---|---|---|---|
| Dealership OEM fob | $200–$500 | 3–7 days (includes ordering) | Newer cars, warranty coverage, multiple fobs |
| Locksmith with scanner | $100–$250 | Same day or next day | Budget-conscious, need it fast, prefer mobile service |
| Self-programming aftermarket fob | $15–$80 | 15 minutes | Cars that support self-programming, lowest budget |
| Aftermarket fob + locksmith programming | $100–$200 | 1–2 days | Older cars, want to save vs. OEM, need professional may provide |
Frequently Asked Questions
Can I program a fob from a different car to mine?
No. Fobs are paired to specific vehicles using encrypted codes. A fob from another car will not work on yours, even if it is the same make and model year. You must program a fob that is designed for your car's year, make, and model.
What if I lose my only fob and do not have a spare?
You can still unlock and start your car using the physical key, though the process is slower. Most cars have a keyhole on the driver's side door (sometimes hidden under a cover). Once inside, you can start the engine with the key or by holding the fob near the start button. Contact a locksmith or dealership to get a new fob programmed as soon as possible.
How long does a fob battery last?
Most fob batteries last three to four years with normal use. If your fob stops working, try replacing the battery first — it costs $5 to $10 and takes two minutes. If a new battery does not fix it, the circuit board or buttons are likely damaged and you need a replacement fob.
Will an aftermarket fob work as well as an OEM fob?
Aftermarket fobs work just as well as OEM fobs once programmed, but they may have lower build quality and shorter lifespans. They are a good budget option if your car supports them. If you plan to keep your car for many years, an OEM fob may be worth the extra cost.
Can I program multiple fobs at once?
Yes, if you are using a dealership or locksmith. Most can program several fobs in one session. If you are self-programming, you program one fob at a time using the same sequence. Ask your programmer whether there is a discount for multiple fobs.