A smart key is the type of key your 2011 Lexus IS uses. It contains a programmed chip that communicates with your vehicle's immobilizer system to verify it is an authorized key before the engine will start. It also has 4 buttons for remote lock, unlock, and other functions. When a key breaks, the chip inside may still be functional, but the physical damage usually means a full replacement is the safest option to avoid getting stranded again.

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Q: My Lexus says key not detected. What do I do?

First, try holding the fob directly against the start button and pressing. Your Lexus can power the transponder chip like an RFID tag even when the fob battery is completely dead, so this works indefinitely as long as the chip is healthy. If that gets the car started, replace the battery with a fresh name brand CR1632. If holding the fob to the button does not work, the issue may be the key itself or the vehicle's reception module. Some GX460 owners found that a software configuration setting had disabled smart key reception, and simply turning it back on fixed the problem without replacing anything.

Q: What is the FCC ID for the 2011 Lexus IS key?

The FCC ID is HYQ14AAB, HYQ14AEM. This is the identifier printed on the back of your key fob that tells us exactly which key your vehicle requires. It ensures we match the correct blank, chip frequency, and remote protocol so the key programs correctly on the first attempt. If your existing key is damaged and you cannot read the FCC ID on the back, give us your VIN and we can look it up to confirm the right replacement.

Q: Is all-keys-lost more expensive than a regular replacement?

Yes. When you have at least one working key, adding a spare is a quick programming job. When every key is lost, the Lexus smart key computer needs to be fully reset and new keys programmed from scratch. An LS430 owner reported the dealer quoting $1,500 for all-keys-lost versus a few hundred for a spare key when a working key was present. Locksmiths in the same area quoted $350 to $600 for the same AKL job. The gap between add-a-key and all-keys-lost is real, which is why we always recommend getting a spare made while you still have a working key.

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All Lexus IS Keys Lost? Compare Options

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Average Cost

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Location

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Wait Time

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✕ 2-5 days

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✓ Yes

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2011 Lexus IS Smart key Replacement - Fast, Affordable & Professional

The OEM versus aftermarket question on 2011 Lexus IS keys deserves an honest answer. OEM Lexus fobs come from the factory supplier with the Lexus logo on the housing and a premium price tag. Aftermarket smart keys use the same blade profile, same chip type, same button layout, and the same circuit design. When the aftermarket blank is quality sourced, the daily-use difference is zero.

A customer visiting his parents in Oxnard for the holidays asked me directly whether his spare would be as good as a dealer fob. He had a 2011 Lexus IS and wanted a key for daily carry, not an emergency backup collecting dust. Fair question.

I carry aftermarket blanks tested across hundreds of Lexus and Toyota jobs. The blade is the same TOY43 profile. The chip is the correct 8A generation. His fob, FCC ID HYQ14AAB, was a 4-button smart key and the aftermarket housing has the same button feel, same weight, same finish. The only visible difference is no Lexus logo.

His total was 349. Dealer charges 633 for the OEM version. Where aftermarket goes wrong is cheap sourcing. I test every batch and return anything that doesn't meet my standards.

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E

Edelson E.

Oct 2025

★★★★★

“I got locked out of my vehicle and also lost my key. Marco came out, made a new key for my Toyota, and got me back on the road. He was professional, friendly, and clearly knows what he is doing.”

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Winter K.

Dec 2025

★★★★★

“I lost my key and called EZ Car Keyz. Marco was great. He arrived quickly, explained everything clearly, and kept me informed throughout the entire process. The service was fast, professional, and fairly priced.”

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Dan G.

Mar 2024

★★★★★

“They responded instantly, showed up within an hour, and arrived exactly when they said they would. Made a copy and programmed a fob for my 2014 car with a worn ignition in about 15 minutes. The new key works perfectly and feels like a dealer key.”

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Lost Your Lexus IS Key? Here's What to Know

Mobile service FAQ

My key broke in the ignition. Can you get it out?▼

Yes. On Lexus models with a traditional ignition cylinder, we can extract the broken piece without damaging the lock. Once it is out, we pull the original key code from your door lock or vehicle records and cut a factory spec blade so you are not reusing a worn key. On push-button Lexus models, the emergency blade can snap in the door lock if forced. We remove the broken piece, decode the lock, and cut a new blade that matches exactly.

What is a smart key?▼

My Lexus says key not detected. What do I do?▼

What is the FCC ID for the 2011 Lexus IS key?▼

Is all-keys-lost more expensive than a regular replacement?▼

Questions? Call (805) 790-8162