2006 Lexus IS key replacement | Wilshire Lock & Key

The 2006–2008 IS uses the same key setup, so everything on this page applies to those years too. The full picture is on the Lexus IS key guide.

2006 Lexus IS: key facts

Key type: Smart / proximity key
Push-to-start: Yes
Transponder chip: Varies by trim — we confirm by VIN
Programming: OBD
All keys lost: We can originate new keys on site

IS250/IS350: SmartAccess push-button start standard from launch. Catalogs confirm the HYQ14AAB fob (board 0140) but rarely name the chip (one catalog lists the 4D-71 smart chip); this first-generation smart system is DST40-based by industry convention, so we leave it unverified. All-keys-lost on early Lexus smart systems historically meant resetting or replacing the smart ECU or a dealer visit; current professional tools usually reset the smart code via OBD — coverage confirmed per vehicle.

What key does a 2006 Lexus IS use?

The 2006 IS250 and IS350 came with SmartAccess push-button start as standard from launch. There is no key to turn in the ignition. The car senses the fob nearby, and you press the start button with your foot on the brake. Inside the fob is a small mechanical key blade, which is your backup if the fob stops working.

Catalogs list the fob for this car as the HYQ14AAB, with board number 0140. That part is well documented. The chip inside is not. The industry generally treats this first-generation smart system as DST40-based, but catalogs rarely name the chip, and one lists a 4D-71 smart chip instead. Because the sources do not agree, we do not treat the chip as settled.

For you as an owner, that means the fob is a real electronic part that has to be programmed to your car. A fob cut or bought online will not start it until it is paired. The mechanical blade will still open the door, but it will not start the engine by itself.

Key type: smart proximity fob with push-button start
Mechanical backup key: yes, built into the fob
Programming method: through the OBD port
Chip family: DST40 by convention, unverified

Duplicate key or all keys lost: what is the difference?

If you still have a working fob, making another is the more straightforward job. The original key is needed for duplication on this setup, and the car can learn the new fob alongside the old one. We cut the backup blade and program the fob through the OBD port. It usually does not require a tow, and we can come to you with a mobile van or you can visit the storefront in Westwood.

All keys lost is also possible on this car, but it is a heavier job. On early Lexus smart systems, all-keys-lost historically meant resetting or replacing the smart ECU, or a trip to the dealer. Current professional tools can usually reset the smart code over OBD instead, which avoids that. We say usually because coverage is confirmed vehicle by vehicle, not assumed from the model name.

Either way, we do not need the dealer to be involved in the normal case, and the OBD route means no removal of dash parts for most cars. If your IS turns out to be one that needs more than a code reset, we will tell you before we start work, not after.

Common problems with 2006 IS smart fobs

The problems we see listed for this model are simple ones, and the first is often fixable without a new fob.

Dead fob battery. The dash reports that the key is not detected and the car will not start. Replace the battery first; if the car starts with the backup procedure, the fob is fine.
Lost fob. Replacing a smart fob costs more than replacing a bladed key, because you are paying for a programmed electronic part.
Water-damaged or crushed fobs. A fob that went through the wash or got stepped on may fail even with a new battery, and then it needs a replacement.

Locked out or need a locksmith now?

We answer around the clock, every day of the year.

Call (213) 577-1366

What affects the price of a replacement?

We do not quote numbers on a web page, because the real figure depends on your situation. These are the factors that move it:

Whether you have a working fob to copy from, or all keys are lost
Whether the smart code can be reset over OBD or the car needs more extensive work
The fob itself: a new part, and whether the board and chip match your car
Cutting the mechanical backup blade
Where you are and the time of day, since mobile service means we travel to you

Call (213) 577-1366 and give us the year, model, and whether you still have a fob.
We confirm the fob and chip by VIN, since sources disagree on this generation.
We tell you what the job involves and what drives the cost.
We cut the blade, program the fob through OBD, and test starting and door function.

One honest note on what is unverified

We have not verified the chip family for this exact year. The DST40 label comes from industry convention, not from a source that names it for the 2006 IS. We would rather say that than guess. When you call, we confirm the fob and what the car needs by VIN, or in person with the car in front of us, before ordering or programming anything.

If you are weighing options, we are one company with a storefront at 10740 Wilshire Blvd and mobile vans, and we have been in business since 1987. David oversees the work. Questions about the paperwork are fair: California requires locksmith companies to hold a BSIS LCO license, and you should ask any locksmith for it. You can also see our other Lexus IS key pages, browse all Lexus models, or start with our car key overview. To describe your car, use our contact page or call.

Frequently asked questions

Can you make a 2006 Lexus IS key if I lost every fob?

Usually yes. Current tools can often reset the smart code over OBD. Older practice on early Lexus smart systems meant resetting or replacing the smart ECU, or going to the dealer, so we confirm coverage for your car by VIN first.

My IS says the key is not detected. Do I need a new fob?

Not necessarily. A dead fob battery is a common cause of that message. Try a new battery first. If the message continues, the fob may be damaged, especially after water exposure or being crushed.

Do I need my original fob to copy it?

Duplication on this setup needs the original key. If you do not have one, the job becomes an all-keys-lost replacement, which is also possible but involves more steps.

Is there a regular key inside the fob?

Yes. The fob holds a mechanical backup key that opens the door. It does not start the car on its own, since the engine requires the programmed fob.

What chip does the 2006 IS fob use?

Not confirmed. This first-generation smart system is generally treated as DST40-based, but catalogs rarely name it and one lists a 4D-71 smart chip. We confirm by VIN before programming.

Can you come to me, or do I tow the car?

We have mobile vans and a storefront in Westwood. Programming is done through the OBD port, so towing is usually not needed. Call (213) 577-1366, answered around the clock.

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Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.

Last updated 2026-10-11.