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Crenshaw Lock

Transponder Key Programming in Sierra Madre · 24/7 mobile

Transponder Key Programming in Sierra Madre, California

Crenshaw Lock Company provides mobile transponder key programming in Sierra Madre, California, 24 hours a day, 7 days a week. We come to your car and program chip keys to its immobilizer on the spot. Call (323) 997-8867 to describe your vehicle and your situation.

  • Mobile to your Sierra Madre location
  • Available 24/7
  • Price quoted before we start
Call (323) 997-8867or tap to call — we answer 24/7
Car key being programmed with a handheld programmer inside a car
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A transponder key looks like an ordinary car key, but inside the plastic head is a small chip that talks to your vehicle's immobilizer. If the car does not recognize that chip, the engine will not run, even when the metal blade turns the ignition perfectly. That is why a copy cut at a hardware counter often opens the door but never starts the car. Programming is the step that introduces a new key to the vehicle.

In a town like Sierra Madre, losing your only key is more than an inconvenience. You might be parked near Kersting Court after dinner, back from a hike at Bailey Canyon Wilderness Park, or at the Mount Wilson Trail trailhead when you realize the key is gone. Our service is fully mobile. There is no shop to tow your car to, because we bring the equipment to wherever the vehicle is sitting.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, led by owner and lead technician David Shar. Transponder work is one of the services where experience matters most, because each make, model and year can handle keys a little differently. We will tell you plainly what your vehicle needs before we begin, and we will not promise something the car cannot support.

How it works in Sierra Madre

  1. 1

    You call and tell us about the vehicle

    Phone (323) 997-8867 any hour and give us the make, model and year, plus whether you still have a working key. We will explain what is involved, including whether this looks like an add-a-key situation or an all-keys-lost situation, and confirm we can come to you in Sierra Madre.

  2. 2

    We come to the car

    Because we are fully mobile, the work happens wherever the vehicle is parked, whether that is a driveway near the village, a curb along Sierra Madre Blvd, or a spot near a trailhead. There is no need to tow the car or bring it anywhere.

  3. 3

    Verify ownership

    Before we create a key for any vehicle, we ask for reasonable proof that you are the owner or authorized user, such as ID and registration. This protects you and is a standard part of responsible automotive locksmith work.

  4. 4

    Cut the key and prepare the chip

    If you need a new key, we cut the blade to match your vehicle's lock and prepare a compatible transponder or key. Where the vehicle uses a different style of key or fob, we will explain the options before proceeding.

  5. 5

    Program to the immobilizer

    We connect programming equipment to the vehicle and register the new key with its immobilizer system. Depending on the vehicle, existing lost keys can often be removed from the system so a missing key no longer starts the car.

  6. 6

    Test everything before we leave

    We confirm the key opens the doors, turns the ignition and starts the engine, and we check any remote functions that apply. You leave with a key you have seen working, not just one we hope will.

Need transponder key programming in Sierra Madre?

24/7 Mobile Locksmith across Greater Los Angeles & Ventura County. We answer 24/7.

Call (323) 997-8867

What affects the price

  • Make, model and year of the vehicle, since some manufacturers use more involved security systems than others.
  • Whether you have a working key already (adding a spare) or have lost every key, which changes how much of the process is required.
  • The type of key: a basic transponder blade, a remote-head key, a flip key or a push-button smart key each involve different parts and procedures.
  • Whether the key blade must be cut from scratch, and how complex that cut is.
  • How many keys you need programmed in the same visit.
  • Time of day and location, as after-hours and out-of-the-way calls can differ from a daytime visit nearby. We will talk through these factors by phone before work begins.

Why Sierra Madre chooses us

  • Fully mobile and available 24/7, so a lost key at night near Kersting Court does not have to wait for a shop to open.
  • Decades of experience: Crenshaw Lock Company has served Southern California since 1987.
  • Owner-led service from David Shar, so the person guiding the work knows the trade firsthand.
  • We are a locksmith as well as a key programmer, so we can also handle your home or shop locks in the same relationship, from Craftsman cottages to small storefronts.
  • We explain what your specific vehicle needs and say so honestly if a dealer is the better route for an unusual model.
  • We test the finished key before we leave, rather than handing it over unverified.

Transponder Key Programming across Sierra Madre

Sierra Madre is a compact foothill town, and the way people live here shapes how car-key problems happen. Around Downtown Sierra Madre and Kersting Court, cars sit at the curb while people shop, eat and stroll, and a key can quietly vanish from a pocket or table. In Sierra Madre Canyon, narrow, steep lanes mean parking is tight and vehicles often sit near trailheads and cabins. We work in both areas, and being mobile means we are comfortable bringing tools to a tight spot.

We serve addresses across ZIP codes 91024 and 91025, including the streets off Sierra Madre Blvd, Baldwin Ave, Michillinda Ave and Sierra Madre Villa Ave. If your car is stuck after a day on the Mount Wilson Trail, at Bailey Canyon Wilderness Park, or near Mary's Market, give us a call and we will work out where to meet your vehicle. Drivers who commute along the nearby I-210 Foothill Fwy sometimes call us from a different city, and we will tell you honestly whether we can reach you.

Many Sierra Madre households also have older homes with their own lock quirks, from early-1900s Craftsman cottages near the wisteria vine to Canyon cabins with original skeleton-key mortise locks. If you are dealing with a lost car key and a house key at once, we can discuss both in a single call. For vehicles, though, this page is about one thing: getting a properly programmed transponder key in your hand.

Locked out or need a locksmith now?

24/7 Mobile Locksmith across Greater Los Angeles & Ventura County. We answer 24/7.

Call (323) 997-8867

Other Sierra Madre locksmith services

See all of our Sierra Madre services, or our citywide transponder key programming page.

Transponder Key Programming in Sierra Madre — FAQs

What is a transponder key?
It is a car key with a small chip inside the head that communicates with your vehicle's immobilizer. The engine will only start if the car recognizes the chip, which is why the blade alone is not enough. Call (323) 997-8867 if you are unsure which type of key your car uses.
Can you program a key if I have lost all my keys?
In many cases, yes. All-keys-lost situations are more involved than adding a spare, and the answer depends on your vehicle. Tell us the make, model and year when you call (323) 997-8867 and we will explain what is possible.
Do I need to tow my car to Sierra Madre for programming?
No. We are fully mobile and do the work where your vehicle is parked, whether that is a driveway, a street near Kersting Court or a lot near a trailhead. We do not operate a storefront.
Are you available at night and on weekends?
Yes. Crenshaw Lock Company is available 24 hours a day, 7 days a week. Phone (323) 997-8867 any time and we will talk through your situation.
Will you ask for proof that the car is mine?
Yes. We ask for reasonable proof of ownership or authorization, such as ID and registration, before making or programming a key. This protects vehicle owners and is a normal part of professional automotive locksmith work.
Is a locksmith-programmed key different from a dealer key?
The goal is the same: a key that opens the car and starts the engine. For many vehicles a mobile locksmith can do this without a tow. Some unusual models may need dealer-level support, and we will say so honestly rather than guess.
Can a lost key be removed from my car's system?
On many vehicles, programming a new key can also erase previously registered keys so a lost one no longer starts the car. Whether this applies depends on your vehicle, so ask us when you call.
How is the price determined?
It depends on factors such as the vehicle, the type of key, whether you have a working key, how many keys you need and the time and location of the call. We do not quote numbers on this page, but we will explain what affects your cost when you reach us at (323) 997-8867.
DS

Reviewed by David Shar — Owner & Lead Technician

Crenshaw Lock Company has served Greater Los Angeles & Ventura County since 1987.

Last updated 2026-10-12.

Call (323) 997-8867 · Open 24/7