2003 Lexus IS
Verified Locksmith Key Replacement in Ventura County

Q: Do I need to tow my car to the dealer if I have no keys?

No. That is the dealer route, not the only route. Lexus dealers require the car to be towed in for all-keys-lost programming because their process is tied to the service bay. One RX350 owner was told by the dealer that the car had to be towed in from two hours away. We bring professional Lexus-specific tools to your location and handle the smart key reset, cutting, and programming right at your vehicle. No tow truck, no flatbed bill, no leaving your car at the dealer overnight.

Q: How long does an all-keys-lost replacement take?

On newer Lexus models with push-button start, the factory security system forces a roughly 16 minute countdown before it will accept new keys. Total on-car time usually runs 20 to 30 minutes once we are connected. Compare that to the dealer route where you are looking at a tow, waiting for a fob to be ordered if it is not in stock, and a service appointment that could be days or weeks out. We handle Lexus all-keys-lost same-day in a single visit, typically under an hour from arrival to handing you a tested key.

Q: What battery does the 2003 Lexus IS key fob use?

The 2003 Lexus IS uses a CR1616 battery. You can pick one up at most auto parts stores or pharmacies for a few dollars. When we make a replacement key, we always install a fresh battery so you are starting with a full charge. Pro tip: once you have your new key, pick up a spare battery and keep it in your wallet or glove box. A dead battery is the most common reason Lexus owners think they have a key problem.

Q: Can you make a spare at the same time so I have two keys?

Yes, and we strongly recommend it. Once the security system is open and talking to our tools, adding a second key at the same visit is far cheaper than doing it later from scratch. If you come back for a second key later, we would need to run the full programming session again. Many Lexus owners who go through an all-keys-lost situation learn the hard way and choose to have us program two keys on the spot. The incremental cost for the second key is much lower than a separate visit.

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min arrival

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No Tow Required

We come to wherever the car is sitting

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2003 Lexus IS
Key Options

Licensed, insured, and backed by 1,000+ five-star reviews

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All Lexus IS Keys Lost? Compare Options

Lost all your keys? Compare your options

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

Lost all your keys? No tow truck needed

Emergency Call (805) 790-8162

2003 Lexus IS Remote head key Replacement - Fast, Affordable & Professional

A customer at the country club in Moorpark told me he'd already paid another locksmith full price for a 2003 Lexus IS key that never worked. The engine cranked but the smart system killed fuel after two seconds. The other locksmith said the smart ECU was bad and walked away.

The ECU was fine. The locksmith hadn't completed the full Lexus key registration. The smart system requires a specific security sequence including seed calculation and a timed registration. Rushing it means the key writes temporarily but doesn't commit to permanent memory.

I used my TOY43 Lishi to verify the blade cut, then connected through OBD. I cleared the failed registration, ran a clean smart key learn with the full security timer, and confirmed the new key was permanently written. His key with remote, FCC ID HYQ1512V, started the engine clean on three consecutive tests. I showed him the IM608 confirmation screen.

He paid me 185. Dealer charges 395 for the same work. He'd already paid the first locksmith too. But I could make sure the job was actually done right this time.

Trust the Pros for Your Lexus IS Key

BSIS licensed, NASTF certified, Google Guaranteed. Trusted by 1,000+ customers in Rustic Canyon Golf Course in Moorpark.

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BSIS Licensed

LCO#6792

CA Bureau of Security & Investigative Services

NASTF Certified

National Automotive Service Task Force

Fully Insured

Liability & vehicle damage coverage

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Saving You Money, One Key at a Time

Real work, real savings

2003 Lexus IS

Remote head key | Save vs Dealer

25-30 min

Fast, Fair Service

Available Today

Moorpark

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805 Area

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Why Lexus Customers Trust Us

Licensed, certified, and proven

N

Natasha S.

Sep 2025

★★★★★

“Very professional and extremely affordable. The price was literally about three times cheaper than what my dealership quoted me. Fast service and no stress at all. Highly recommend.”

Google Review

J

Joseph C.

Apr 2024

★★★★★

“I needed two keys made for my Honda Element. Friendly, fast, fair pricing, and far better than any other locksmith I have used in the area. Best service by far.”

Yelp Review

T

T Klein

May 2020

★★★★★

“I needed a second key made for my 2012 Nissan Altima. They arrived quickly, finished in about 15 minutes, and gave me the best price I could find.”

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EZ Car Keyz technician with satisfied customer

★ 5.0 out of 5 - Based on 1,000+ Google Reviews

Certified Pro (805) 790-8162

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

What to expect when we arrive

I lost all my Lexus keys. Can you still make a new one?▼

Yes. All-keys-lost is one of the most common calls we get on Lexus vehicles. We access and reset your Lexus smart key computer, then program brand new keys so the lost ones no longer start the car. This works on RX, ES, NX, IS, GX, UX, LS, LC, and RC models. Lexus dealers will tell you to tow the car in and can quote $500 to over $1,500 depending on the model. We come to you and handle the entire job on site.

Do I need to tow my car to the dealer if I have no keys?▼

How long does an all-keys-lost replacement take?▼

What battery does the 2003 Lexus IS key fob use?▼

Can you make a spare at the same time so I have two keys?▼

Questions? Call (805) 790-8162