Why a Spare Car Key Is Worth It — and How to Get One Made
A spare key feels like an optional extra — until the only key you own is lost, snapped, or sitting in a locked car. Making a spare while you still have a working key is one of the cheapest pieces of insurance a car owner can buy.
The math: a spare is the cheap option
When you still have one working key, a locksmith can usually clone or program a duplicate relatively quickly and affordably. But if you lose your only key, it becomes an "all-keys-lost" job: the locksmith has to originate a key from scratch and reset the car's security to invalidate any missing keys — more time, more equipment, more cost. Making a spare now is almost always cheaper than waiting until you're down to zero.
The other payoff: you're never stranded
The real value shows up at the worst possible moment — a lost key on a trip, a fob that fell in a lake, a key locked inside. With a spare at home or with a trusted family member, an inconvenience stays an inconvenience instead of becoming a tow and an emergency-rate replacement.
How a spare gets made
- Bring (or have ready) your working key and your year, make, and model. The VIN helps too.
- The blade is cut to match your existing key or your lock.
- The chip or fob is programmed to your car's immobilizer so the spare actually starts the engine, not just opens the door.
For most vehicles a mobile automotive locksmith does this at your home or office, often in well under an hour.
Where to get it done
- Mobile automotive locksmith. Comes to you, handles most makes and models, and usually beats the dealer on price — no appointment-and-wait at a service department.
- The dealership. Always an option, especially for very new or high-security vehicles, but typically pricier and may require leaving the car.
- Hardware-store kiosk. Fine for a plain mechanical blade on an older car, but it can't program a transponder or smart key — so for most modern vehicles it won't produce a key that starts the car.
Care for your spare
Keep the spare somewhere safe and dry (moisture is hard on fob electronics), test it occasionally so you know it works, and if it's a fob, swap its battery when you swap your main one. A spare you can't find or that's dead defeats the purpose.
Car-key & lockout guides
A calm step-by-step to get back in fast — without damaging your car.
Read the guide → Lost key, no spare?How a locksmith cuts and programs a new key on the spot.
Read the guide → What does a new key cost?Honest 2026 price ranges by key type, and how to avoid overpaying.
Read the guide → Fob not working?The quick checks before you assume the worst — and when to call.
Read the guide → Key types, explainedTransponder vs. fob vs. smart key — what's inside, and why it costs what it does.
Read the guide → Avoid locksmith scamsThe red flags of bait-and-switch locksmith scams — and how to hire safely.
Read the guide → Key won't turn?Why a key sticks in the ignition — and the gentle fixes to try before you call.
Read the guide → How long to make a key?Realistic timeframes by key type — and what can speed it up or slow it down.
Read the guide → Key broke off in the lock?How to avoid making it worse — and what extraction actually involves.
Read the guide → Locksmith or dealership?A straight comparison — and the cases where only a dealer will do.
Read the guide →This guide is general information for educational purposes only — not professional automotive, security, or safety advice. If a child or pet is locked in a vehicle in heat or cold, call 911 immediately. Costs and procedures vary by vehicle, key type, and locksmith, and change over time. Confirm specifics with a qualified automotive locksmith and your vehicle's owner's manual before acting.