Last week we got three calls in a row from folks who had just bought used cars around Altadena — one from a private seller off Lake Ave, one from a small lot near Lincoln, and one from a CarMax up in Duarte. All three had the same problem: only one key came with the car, and they wanted a backup before that lonely key got lost or chewed up by a washing machine.
If that sounds like your situation, here are the questions we hear most often from local drivers, with straight answers from our team.
Why do used cars so often come with only one key?
Dealerships and private sellers lose spares all the time. Sometimes the previous owner misplaced it years ago, sometimes a trade-in came in short and the lot never bothered to cut a replacement. Modern transponder and proximity keys cost real money to program, so a dealer who’s trying to move a $14,000 Civic isn’t going to spend $300 making a spare unless you negotiated it into the deal. By the time you notice, you’ve already signed the paperwork.
The good news: getting that second key made in Altadena is usually faster and cheaper than going back to the selling dealer. Our service comes to wherever you are — your driveway off Mendocino, the Vons parking lot on Lake, or your office near JPL.
How much does a spare key cost in Altadena?
Pricing depends entirely on what kind of key your car uses. Here’s a rough breakdown of what we charge mobile in the Altadena area:
- Basic transponder key (older Toyota, Honda, Ford, most 2000s–2010s vehicles): $140–$220
- Remote head key / flip key: $180–$320
- Smart proximity fob (push-to-start cars, mid-2010s and newer): $260–$480
- Luxury or European (BMW, Mercedes, Audi, Land Rover): $400–$900+
Dealers in Pasadena and Glendale typically charge 40–80% more than mobile locksmiths for the same key, plus you pay to tow the car if your one key fails before you make it there. Worth a quick price comparison before you commit.
Can you make a spare if I only have the original key with me?
Yes — and this is actually the easiest scenario. When you have a working key, we can read the data from your vehicle’s immobilizer and pair a new blank to your car in 20 to 45 minutes for most makes. No tow truck, no waiting for parts to ship from the dealer.
If you ever lose that one original and have zero working keys, the job gets longer and pricier because we need to generate a key from the vehicle’s onboard computer or pull a code from the lock. That’s another reason to make the spare now rather than next month.
What do I need to bring or have ready when the locksmith arrives?
Three things, every time:
- The vehicle title or current registration showing your name. We won’t make a key for a car you can’t prove you own — that’s a hard rule, no exceptions.
- Photo ID matching the name on the title.
- The car itself, with the existing working key. We need the vehicle on site to program anything electronic.
If you just bought the car and the title transfer is still in the mail, your signed bill of sale plus the seller’s signed-off title works fine. We’ve had plenty of customers in this exact spot — common after a Saturday purchase.
Will my old key still work after you program a new one?
For nearly every car built in the last 20 years, yes. We add the new key to the vehicle’s memory without erasing the existing one. You’ll drive away with two working keys.
The exception is when someone has lost a key and is worried the finder might use it — in that case we can do a full re-pair that erases all previous keys and only authorizes the ones currently present. Useful if you bought a car from a sketchy private seller and want to make sure no surprise third key shows up later.
Should I get the key cut at a hardware store and program it myself?
You can buy a blank online and have the metal blade cut at a hardware store on Lincoln, but that gets you a key that physically turns the lock and nothing more. Without the transponder chip programmed to your car, the engine won’t start. Some DIY programming procedures exist for specific older Fords and Chryslers, but for anything mid-2010s or newer, you need a locksmith’s equipment.
If you do want to handle the cutting yourself and just need the programming done, we also offer as a separate service. For a full list of what we cover locally, see our Altadena locksmith services page.
Ready to make that spare?
Most car key replacement Altadena jobs wrap up in under an hour at your location. Give the Locksmith HQ Team a call at (818) 398-9391 with your year, make, and model — we’ll quote you over the phone and have a tech out the same day in most cases.
