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Crenshaw Lock

Transponder Key Programming in Duarte · 24/7 mobile

Transponder Key Programming in Duarte, California

Crenshaw Lock Company provides 24/7 mobile transponder key programming in Duarte, California. We come to your vehicle and program chip keys to its immobilizer, whether you lost your only key or need a spare. Call (323) 997-8867 any time, day or night.

  • Mobile to your Duarte location
  • Available 24/7
  • Price quoted before we start
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Car key being programmed with a handheld programmer inside a car
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A modern car key is more than a cut piece of metal. Inside the plastic head is a small transponder chip that talks to your vehicle's immobilizer, and if the car doesn't recognize that chip, the engine won't run, no matter how perfectly the blade turns in the ignition. That is why a key from a hardware counter often opens the door but never starts the car. Programming is the step that teaches the vehicle to accept a particular key.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, and we are fully mobile. There is no storefront to drive to, which matters most when the reason you need a key is that you can't drive. Whether you are parked on Huntington Drive, in a driveway in Butler or Cotter, or in a lot near City of Hope, we bring the equipment to you.

This page explains how transponder programming works in practice, what affects the cost, and what to expect when you call from Duarte. If you'd rather talk it through, David Shar and the team answer at (323) 997-8867 around the clock.

How it works in Duarte

  1. 1

    You call and describe the vehicle

    Tell us the make, model and year, and whether you still have a working key. That tells us whether we are adding a spare, which is usually simpler, or handling an all-keys-lost situation, which takes more steps. Call (323) 997-8867 and we'll go over what to expect.

  2. 2

    We come to you in Duarte

    Because we are mobile and available 24/7, we meet you where the car is: a driveway off Mountain Avenue, a street near Encanto Park, a parking structure, or a trailhead lot near Fish Canyon Falls. We don't ask you to tow it to a shop first.

  3. 3

    We verify ownership

    Before any key is made or programmed, we ask for proof that the vehicle is yours, such as registration and matching identification. This protects you, and it is a standard, responsible practice in vehicle key work.

  4. 4

    We prepare the key

    If the key blade needs cutting, we cut it to match the vehicle's code or ignition. We also confirm that the transponder chip we are using is compatible with your vehicle's system, since the wrong chip simply won't be accepted.

  5. 5

    We program the key to the immobilizer

    Using diagnostic programming equipment connected to the vehicle, we register the new key with the car's immobilizer. Depending on the vehicle, this may also involve erasing a lost key from the system so it can no longer start the car.

  6. 6

    We test everything

    We check that the key unlocks the doors, turns in the ignition, and starts the engine, along with remote functions where applicable. You leave knowing each key works before we go.

Need transponder key programming in Duarte?

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, because some manufacturers' immobilizer systems are more involved to program than others.
  • Whether you are adding a spare key or have lost every key, since all-keys-lost jobs usually take more steps and equipment.
  • The type of key: a basic transponder chip key, a key with a remote head, or a push-button smart key each involve different parts and programming.
  • Whether the key blade needs to be cut, and whether it is a standard or a high-security laser-cut style.
  • Time of day and location, since we are available 24/7 and travel to you, so late-night or hard-to-reach calls can affect the quote.
  • Whether the vehicle's existing keys need to be removed from the system for security reasons.

Why Duarte chooses us

  • We are fully mobile, so the work happens at your car in Duarte rather than at a shop you would have to reach somehow.
  • We have been serving Greater Los Angeles and Ventura County since 1987, which means decades of experience with the way vehicle security systems have changed.
  • We are available 24/7, which matters when a lost key strands you after a late shift at City of Hope or a hike near Fish Canyon.
  • We verify ownership before programming, which protects you and keeps the work above board.
  • We test every key and its functions before we leave, rather than handing over something that merely looks right.
  • We explain the options in plain language, including when a spare is the smarter choice, so you can decide with clear information.

Transponder Key Programming across Duarte

Duarte sits right where the I-210 and I-605 meet, and its residents are often on the move: commuting along Foothill Freeway, heading to shifts at the City of Hope medical campus, or running errands along Huntington Drive, the old Route 66. That daily driving is exactly when a key goes missing, in a hospital parking structure, at the Duarte Recreational Trail along the San Gabriel River, or at a trailhead.

The neighborhoods have different rhythms. In the 1950s and 1960s ranch and tract homes of Butler and Cotter, families often have several vehicles parked in driveways and on the street, and a single spare key is common. Up toward Royal Oaks and the Fish Canyon area, custom foothill homes mean longer driveways and sometimes gated entries, so having a dependable spare for each car makes sense. Newer condos and apartments near the A Line often have shared or tight parking, where a lost key can be especially inconvenient.

Whether you are in ZIP code 91010 or 91009, we come to your location. If you work near City of Hope and have lost a key mid-shift, or you're at home and realize you have no spare, call (323) 997-8867 and we'll head your way.

Locked out or need a locksmith now?

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Other Duarte locksmith services

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

Transponder Key Programming in Duarte — FAQs

What is a transponder key?
It is a key with a small chip in its head that communicates with your vehicle's immobilizer. The car will only start if it recognizes the chip's code, which is why a plain cut key often will not work.
Can you program a key if I've lost all of mine in Duarte?
In most cases, yes. All-keys-lost situations take more steps than adding a spare, but we can usually handle them at your vehicle. Call (323) 997-8867 with your vehicle details and we'll explain what to expect.
Do I need to tow my car to you?
No. We are fully mobile and come to wherever the car is in Duarte, whether that's a driveway in Butler, a street near Encanto Park, or a parking lot near City of Hope. There is no storefront to visit.
Is it cheaper to have a spare made before I lose my only key?
Generally, adding a spare while you still have a working key is simpler than an all-keys-lost job, since there are fewer steps involved. We can't quote a figure here, but calling (323) 997-8867 will get you a clear estimate.
Will you ask for proof that the car is mine?
Yes. We verify ownership with registration and matching identification before making or programming a key. It is a routine safeguard that protects you.
Can a lost key be removed from the car's system?
On many vehicles, yes. During programming we can often erase a lost key so it can no longer start the car, which is worth asking about if the key may have been stolen.
Do you work late at night or on weekends?
We are available 24/7. If you are stranded after a late shift or a weekend hike near Fish Canyon Falls, call (323) 997-8867 any time.
Can you program smart keys and push-button start fobs?
Many of them, yes, though it depends on the vehicle. Tell us the make, model and year when you call so we can confirm what's possible before we arrive.
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