2004 Lexus IS
Key Replacement - Save vs Dealer in Ventura County

Q: Can you delete lost or stolen keys from my 2004 Lexus IS so they can't be used anymore?

Yes. When we do a security reset, the immobilizer is cleared of all previously registered keys. Only the new keys you authorize get written back in. Whatever is out there - lost, stolen, or just an old spare you can't account for - those will no longer start the vehicle. It's the same process the dealer runs on site, done at your location without towing.

Q: Does my 2004 Lexus IS key have a hidden emergency blade I can use if the fob dies?

Yes. The remote head key on this generation has a mechanical blade built into the unit. It's not a separate insert like you'd find on a later proximity fob, but the blade itself is a physical cut key that operates the door lock cylinder directly. If the battery dies or the remote stops responding, you can still unlock the driver door manually with the blade.

Q: My 2004 Lexus IS remote works sometimes and not others. Is the fob failing or is it something else?

Intermittent remote response on this generation is almost always the CR1616 battery before it's anything else. The CR1616 runs thin and the contact tension inside the fob can lose its grip before the battery is fully dead, so you get inconsistent range or a fob that only works close up. Open the fob, swap the battery, and press the contacts down slightly if they look relaxed.

Q: I bought a replacement fob online for my 2004 Lexus IS. Can I program it myself?

No. This vehicle does not have a DIY remote head key programming sequence. It requires diagnostic equipment connected to the OBD port to register both the transponder and the remote to the vehicle. If you have an uncut, unprogrammed blank sitting on your desk, bring it to me and I'll cut and program it on site in Downtown Moorpark. You'll save money on the part, and I'll handle the rest.

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Remote Head Key

Dealerships charge a premium because they can. We don't. Same key, same programming, same quality - just without the markup. Call for an honest quote with no hidden fees.

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Verified locksmith 2004 Lexus IS key specs from EZ Car Keyz Moorpark CA

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2004 Lexus IS
Key Options

Dealer-grade key for a fair, honest price

Remote Head Key

Lexus IS: Dealer Markup vs Fair Pricing

Real numbers, real savings on your key

EZ Car Keyz

Dealership

Average Cost

✓ $$

✕ $$$$

Location

✓ We come to you

✕ You drive there

Wait Time

✓ 20-45 min

✕ 2-5 days

Same-Day

✓ Yes

✕ Rarely

All Keys Lost

✓ No problem

✕ Tow required

OEM Quality

✓ Yes

EZ Car Keyz wins 5 out of 6

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2004 Lexus IS Remote Head Key Replacement - Fast, Affordable & Professional

A guy was visiting family in Downtown Moorpark over the holidays, staying a few blocks off High Street, and he tracked me down because he wanted a working spare before he drove back.

He had a 2004 Lexus IS and had been putting off dealing with the key situation for months. His original was worn, the blade was getting a little sloppy in the ignition, and he had no backup at all.

He asked me flat out whether an aftermarket remote head key blank was going to be as good as what Lexus sells over the counter. I told him the honest version: it depends entirely on who sourced it and whether I've tested that batch. I don't carry blanks I haven't run through a few jobs first. The ones I use cut clean, the buttons have the right feel and travel, and they program without fighting the system.

I cut the blade to his vehicle on the spot, programmed the transponder and the remote functions through the OBD port, and handed it to him before his coffee got cold. He clicked the lock button once like he was testing fate, and the car answered.

He asked about the dealer price as an afterthought. I told him it would have been a lot more, plus he'd have needed an appointment and probably a tow if he'd let it go any further. He just nodded and pocketed the key.

Save vs the Dealer on Your Lexus IS Key

Get your key for hundreds less than the dealer. Same quality, same result, better price.

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Lexus IS Rapid Response, Done Right

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2004 Lexus IS

Remote Head Key | Programmed for Less

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Same-Day Keys (805) 790-8162

Happy Customers, Happy Wallets

Fair pricing that earns five stars

J

Jessica G.

Mar 2025

★★★★★

“Highly recommend! Arrived within 40min. Friendly, efficient and quick. I lost my Lexus key and he was able to program and cut a brand new one within 20min. Thank you!!”

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Michael L.

Jun 2024

★★★★★

“Sunday morning key replacement for my 2003 Lexus. Fast, efficient, and a genuine nice person. The price was excellent and I saved hundreds of dollars by avoiding the Lexus dealership. I highly recommend this business as trustworthy and reliable.”

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Jeremías C.

Aug 2024

★★★★★

“Fast affordable and very nice gentleman. The tech Marco came to help us late night and was very professional!”

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Lexus IS Mobile Service FAQ

Real costs, no dealer surprises

What is the cheapest way to handle all-keys-lost on my 2004 Lexus IS?▼

Call a mobile locksmith before you call the dealer. Dealer all-keys-lost quotes on this generation of Lexus can run high, and that is before towing if the car won't move. A locksmith who works Lexus regularly can come to your location, reset the immobilizer, cut and program new remote head keys on site, and the price you get on the phone is the price you pay. No tow, no shop wait, no surprise labor line items.