Lexus Lost Key Replacement & ECU Reflash
Nationwide Mail-In Key Programming, ECU & Immobilizer Reflash Services
Lost All Your Lexus Keys or Only Have the Valet Key?
Some dealerships and local locksmiths can no longer service the immobilizer systems used in certain older Lexus vehicles. Replacement ECUs and immobilizer components may also be expensive, discontinued, or unavailable. ACM Locksmith Group provides nationwide mail-in Lexus lost key replacement and ECU or immobilizer reflashing, preserving your original system whenever possible.
If all keys are lost, we confirm which lock cylinder and electronic components your vehicle requires before you ship anything. We decode the lock, cut replacement keys to match your existing locks, program the correct transponder chips, and reflash the supported ECU or immobilizer module to accept the new keys. No original or working key is required for our supported all-keys-lost service.
Still Have the Gray Valet Key but Lost Your Lexus Master Key?
On certain older Lexus models, the valet key can start the vehicle but cannot authorize normal master-key registration. Our specialized mail-in Lexus master key replacement service can prepare supported systems to accept new master keys while retaining otherwise serviceable original components.
We return your serviced components and programmed keys ready for reinstallation. For supported systems, the completed service is plug-and-play—reinstall the components and use your new keys without additional key programming.
No towing to our facility. No dealership visit required. No unnecessary ECU, immobilizer module, or lock replacement.
Contact us with your Lexus model year, key situation, and photos before removing or shipping any parts.
Why Choose ACM Locksmith Group?
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35+ Years of Experience working Automotive & Motorcycles.
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700+ Real Jobs documented on video—see them on our YouTube channel.
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Nationwide, Tracked Shipping for your peace of mind.
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Fast Turnaround 3-5 days—get back on the road sooner.
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No Hidden Fees—Transparent, Upfront Pricing every time.
Lexus Key, ECU & Immobilizer Services
Lost All Keys - New Keys Cut & Programmed
We decode the existing lock cylinder and cut new keys to match the original key cuts, so your locks do not need to be changed. We then reflash the ECU or immobilizer module to accept the new keys—no original key required.
ECU & Immobilizer Module Reflash
We reflash your Lexus ECU or immobilizer module to accept newly programmed keys and return the system ready for installation.
Transponder Chip Keys
We cut and pre-program transponder chip keys for supported older Lexus models.
Spare & Broken Keys Replacedment
We duplicate working keys, clone transponder-chip data when needed, and can often create a replacement from a broken or damaged key.
Ignition Lock Rebuild & Repair
Is your Lexus ignition lock worn, seized, or difficult to turn? We can rebuild, repair, or replace the lock cylinder and match it to your key.
Real Lexus jobs - from our YouTube channel
Visit our YouTube channel - 700+ Video's - 35+ years in the trade
Mail-in service - ship from anywhere in the US
5 simple steps: Turn around time 3-5 business days
(1) Fill out the service request form:
Tell us your Lexus year, model and how we can help you. Takes 2 minutes at:
www.acmlocksmithgroup.com/start
(2) We will contact you within 24-48 hours:
You'll get a firm price via call, or text — whichever you prefer. No surprises, no estimates.
(3) Remove and ship your ignition cylinder, ECU or Immobilizer module:
Box it up and ship to our Duluth, GA facility. USPS, UPS, or FedEx all work. We confirm when it arrives.
(4) We cut your new key, reflash and program everything:
We handle the full process in-house and no outsourcing — key cutting, ecu, immobilizer sync, transponder programming. Most jobs done in 3-5 business days.
(5) We ship your cylinder and new keys back:
Everything ships back to your door. Your Lexus will now start on the first turn.
Nationwide Lexus Mail-In Service — All 50 States
Lost all your keys or need a spare? We handle lost key replacement, key duplication, and all-keys-lost situations entirely by mail, wherever you are in the US.
West Coast & Pacific:
California · Oregon · Washington · Nevada · Alaska · Hawaii
Mountain & Southwest:
Arizona · Colorado · Utah · New Mexico · Idaho · Montana · Wyoming
Midwest:
Illinois · Michigan · Indiana · Missouri · Ohio · Wisconsin · Minnesota · Iowa · Nebraska · Kansas · South Dakota · North Dakota
Northeast & Mid-Atlantic:
New York · Pennsylvania · Massachusetts · Maryland · New Jersey · Connecticut · Rhode Island · Virginia · Washington DC · Delaware · Maine · New Hampshire · Vermont · West Virginia
South & South Central:
Texas · Tennessee · North Carolina · Georgia · Florida · Louisiana · Alabama · South Carolina · Mississippi · Arkansas · Oklahoma · Kentucky
If your local locksmith can't help — we can. Ship your parts to us and we'll have you back on the road riding again. All we need is 3-5 business days and we ship back to you.
Common questions
FAQ — Lexus Lost Key Replacement
Do I need a working key to use this service?
No. We specialize in lost-all-keys situations. Ship us the door lock, ECU or immobilizer module and we work from that — no original key required at any point in the process.
Does the immobilizer module or ECU need to be reprogrammed too?
Yes — on most Lexus models the key and Ecu or immobilizer are electronically paired. We handle the full programming sequence so your vehicle starts and runs exactly as it should.
Is this cheaper than a dealer?
Yes, almost always significantly cheaper. Dealers charge full labor rates plus parts markup. We bundle labor and materials into one flat price with no dealer overhead — and you never have to tow the vehicle. In most cases dealers no longer service these vehicles because the ecu or immobilizer system parts are discontinued.
Do I need to send both the ECU or Immobilizer module and the door cylinder?
For lost-all-keys situations yes — we need both the ecu or immobilizer module and the door lock cylinder to generate a new working key from scratch. We will tell you exactly what to remove when we contact you after your form submission.
Do I need to tow the whole vehicle to you?
No — usually just the door lock cylinder and Ecu or immobilizer module. We'll tell you exactly what to remove and how to ship it when we contact you after your form submission.
Older Lexus Models - Lost Key Replacement & ECU or Immobilizer Reflash
ACM Locksmith Group specializes in lost key replacement for supported older Lexus vehicles that uses a mechanical key or early transponder key systems. We cut replacement keys from scratch to match your existing locks and provide ECU or immobilizer reflashing when required. Whether all keys are lost or only the valet key remains, our nationwide mail-in service preserves serviceable original components whenever possible.
Lexus Mechanical (Non-Transponder) Key Models Supported:
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1990–1992 Lexus ES250
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1992–1997 Lexus ES300
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1993–1997 Lexus GS300
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1990–1996 Lexus LS400
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1996–1998 Lexus LX450
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1991–1997 Lexus SC300
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1991–1997 Lexus SC400
Lexus Transponder Key Equipped Models Supported:
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1998–2003 Lexus ES300
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1998–2005 Lexus GS300
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1998–2000 Lexus GS400
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2001–2005 Lexus GS430
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2001–2005 Lexus IS300
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1997–2000 Lexus LS400
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1998–2002 Lexus LX470
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1999–2003 Lexus RX300
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1998–2000 Lexus SC300
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1998–2000 Lexus SC400
Lexus Key Profiles & Transponder Chips:
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LXP90 / LXP90-P: Mechanical key blanks used in early Lexus applications; also listed as service or test keys for certain later locks.
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TOY40: Applicable replacement keys include TOY40BT4 with a Texas Instruments 4C transponder.
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TOY48: Applicable early replacement keys include TOY48BT4 with a Texas Instruments 4C transponder.
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Later systems: Some vehicles with similar blade profiles use 4D transponders and require a different key and programming procedure.
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The blade profile alone does not identify the chip or immobilizer system. We confirm the correct application before service.
Lexus Key Cuts & Code Series
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00001–O5000: Commonly associated with early LXP90 / TOY40 applications and an 8-cut key pattern.
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40000–49999: Commonly associated with TOY48 applications.
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Application exceptions: Certain models have overlapping blade listings or different code-series requirements. We verify the lock and cutting specifications for the actual vehicle.
You do not need an original key or a known key code for supported all-keys-lost service. We decode the required lock cylinder and cut replacement keys to match its existing key-cut pattern.
When Standard OBD Key Programming Cannot Add a New Key
For certain supported Lexus systems, losing all master keys requires ECU or immobilizer reflashing rather than standard programming through the vehicle’s diagnostic port. We service the required module on the workbench and prepare it to accept replacement transponder keys.
Lost all keys or only have the valet key?
Send your Lexus model year, key situation, and photos so we can confirm the service and required components before shipping.
Don’t see your model listed? Call or text 678-699-2634 to check availability.
Can’t Find a Locksmith or Dealer You Trust to Replace Your Lexus Keys?
If your local locksmith or dealership cannot help or you are concerned about someone who lacks experience with Lexus immobilizer systems.
ACM Locksmith Group provides nationwide mail-in Lexus key replacement, ECU programming, and immobilizer services for supported vehicles.
Contact us with your model year and photographs before shipping any parts.