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Crenshaw Lock

Transponder Key Programming in Walnut · 24/7 mobile

Transponder Key Programming in Walnut, California

Crenshaw Lock Company provides mobile transponder key programming in Walnut, California, 24/7. We come to your vehicle and program chip keys to its immobilizer, whether you lost every key or just want a spare. Call (323) 997-8867 and tell us the make, model, and year.

  • Mobile to your Walnut 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 key, but a small chip inside it talks to your car's immobilizer. If the chip's code isn't recognized, the engine may turn over and then die, or never start at all. That's why a key copied at a hardware counter often opens the door but won't start the car. Programming is the step that teaches the vehicle to accept the key.

In Walnut, cars are central to daily life. Many households park two or three vehicles on a driveway, residents commute along SR-60 and SR-57, and students drive to Mt. San Antonio College. When the only key goes missing, or a spare never existed, you can't just get a ride to a shop with a dead car in the garage. Crenshaw Lock Company is fully mobile, so we come to you. There is no storefront to visit.

We've served Greater Los Angeles and Ventura County since 1987, under owner and lead tech David Shar. Transponder work has changed a great deal over those decades, and we approach each vehicle on its own terms: some can add a key quickly when a working key is present, while others need more involved procedures when all keys are lost.

How it works in Walnut

  1. 1

    Call and describe the vehicle

    Call (323) 997-8867 any hour. We'll ask for the make, model, and year, how many working keys you have, and where the car is parked. Whether you still have a working key changes the approach, so that detail helps us prepare the right equipment.

  2. 2

    We come to your location

    Because we're mobile, we meet you at your driveway, a parking lot, or wherever the car is. We'll confirm ownership before starting work, which protects you and keeps programming from being misused.

  3. 3

    Verify the vehicle and key type

    We identify the immobilizer system and the correct blank or key type. Some vehicles use a basic chip, others use push-button smart keys or flip keys with remotes, and each requires different tools and procedures.

  4. 4

    Cut the key if needed

    If you need a physical key, we cut it to the vehicle's lock on site. For lost-key situations, we can create a key from the vehicle itself rather than from an existing copy.

  5. 5

    Program to the immobilizer

    We connect diagnostic equipment and register the new key with the car's computer. Depending on the vehicle, this may also involve adding or erasing keys so a lost one can no longer start the engine.

  6. 6

    Test everything before we finish

    We test the key in the ignition or start button, the door locks, and any remote functions. You leave with keys that actually start and run the car, not just ones that look right.

Need transponder key programming in Walnut?

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 immobilizer systems vary widely between manufacturers and generations.
  • Whether you have a working key to copy from or all keys are lost, which changes the procedure and the time involved.
  • Type of key needed: basic chip key, flip key with remote, or push-button smart key.
  • How many keys you want programmed during the same visit.
  • Whether a physical key must be cut, and whether the key needs remote lock and unlock functions.
  • Time of day and the location of the vehicle, since we operate 24/7 and travel to you.

Why Walnut chooses us

  • Fully mobile service: we bring the programming equipment to your vehicle rather than requiring a tow to a shop.
  • In business since 1987, with David Shar as owner and lead tech, so experience with older and newer systems alike.
  • Available 24/7, which matters when a lost key strands you late at night or before an early commute.
  • We explain your options up front, including whether a spare is smarter than waiting for an emergency.
  • We test door, ignition, and remote functions before leaving instead of handing over an untested key.
  • We verify ownership before programming, which protects you if the car or its keys are ever targeted.

Transponder Key Programming across Walnut

Walnut sits between the San Jose Hills and Puente Hills, and its mostly suburban layout means most cars live in driveways and garages. In gated areas such as Snow Creek, and in Walnut Heights, a lost key can be doubly frustrating when you also deal with gate access. We come to the vehicle wherever it is parked, whether in a residential driveway in ZIP code 91789 or elsewhere in 91788.

Near Mt. San Antonio College, students and staff often park for long stretches along Grand Ave and nearby lots. A lost or damaged chip key there is easy to deal with on site, since we work in the lot or at the curb rather than requiring you to leave the car. Commuters who use SR-60 or SR-57 also run into trouble when a worn key stops being recognized in the morning.

Families near Suzanne Park and Creekside Park often keep a spare for a teen driver or a second car, and Walnut's larger lots mean several vehicles per home. If you are thinking about adding a spare before you lose the last one, programming it while you still have a working key is generally the simpler path. Call (323) 997-8867 whenever you need us.

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 Walnut locksmith services

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

Transponder Key Programming in Walnut — FAQs

What is transponder key programming?
It's the process of registering a key's embedded chip with your car's immobilizer so the engine will start. Cutting the metal blade alone isn't enough on most modern vehicles.
Can you program a key if I lost all my keys in Walnut?
In many cases, yes. All-keys-lost situations take more work than adding a spare, but we can often create and program a new key on site. Call (323) 997-8867 with your vehicle details.
Do I need to tow my car?
Usually not. We're fully mobile and come to your car, whether it's in a driveway, a lot near Mt. SAC, or elsewhere in Walnut.
Is it cheaper to add a spare before I lose my only key?
Often it is simpler, since having a working key available can streamline programming. Cost depends on the vehicle and key type, so call (323) 997-8867 to discuss your situation.
Do you work at night and on weekends?
Yes, we're available 24/7. Call (323) 997-8867 at any hour.
Can you program push-button smart keys?
We handle many smart key systems, though it depends on the make, model, and year. Tell us your vehicle when you call and we'll let you know what to expect.
Will a lost key still be able to start my car after programming?
Where the vehicle allows it, we can erase lost keys from the immobilizer so only the keys you now hold will start the car.
What do I need to show you?
We'll ask for proof that you own or are authorized to use the vehicle, such as ID and registration, before programming a key.
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