2003 Toyota 4Runner Key Replacement

The 2003–2009 4Runner uses the same key setup, so everything on this page applies to those years too. The full picture is on the Toyota 4Runner key guide.

2003 Toyota 4Runner: key facts

Key type: Transponder chip key
Push-to-start: No
Transponder chip: Varies by trim — we confirm by VIN
Programming: OBD
All keys lost: We can originate new keys on site

Generation changeover: transpondery.com lists both 4C (through 2003) and 4D-67 (from 2003). The new N210 generally takes the 'dot' key, but we verify from the key stamp or VIN before cutting.

What kind of key does a 2003 4Runner use?

The 2003 4Runner uses a transponder key with a conventional metal blade. There is no push-to-start system on this year. You put the key in the ignition and turn it, but the truck will only run if the chip inside the plastic head is recognized by the immobilizer. That is why a plain hardware-store copy turns the ignition but does not start the engine. The blade can be cut perfectly and the truck will still treat it as a stranger.

2003 is the year the 4Runner changed generations, and that is where the chip question comes from. One reference we use, transpondery.com, lists the older 4C chip as running through 2003 and the 4D-67 chip as starting in 2003. Both can be true for a model year that straddles two builds. Generally the newer generation takes the key with the small dot on the head, but we do not rely on that alone.

For you as the owner, this means the year on your registration does not settle which key your truck needs. The key itself or the VIN does, and we check one of them before anything is cut.

Spare key or all keys lost: how does it work on this truck?

Both situations are possible on this 4Runner. Making a duplicate needs an original working key to copy from. Replacing keys when every key is gone is also possible; it just takes more steps, because the key has to be built from the lock and the vehicle information instead of from a key in hand.

If you still have one key, getting a spare now is the lighter-cost route compared with waiting until you are stranded. If you have none, we can still work on it, and the programming is done through the OBD port under the dash. Nothing in this year's data requires NASTF SDRM access, and nothing in it points you to a dealer as the only option.

You call us and tell us the year, whether you have any working key, and where the truck is parked.
We look at the key stamp if you have a key, or the VIN if you do not, to settle which chip family applies.
The blade is cut to match your locks. With no key in hand, it is cut from the vehicle's information.
The transponder is programmed to the truck through the OBD port.
We test the key in the door and the ignition, and start the engine, before we call the job done.

Locked out or need a locksmith now?

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

Call (213) 577-1366

What affects the cost of a 2003 4Runner key?

We will not quote a number on a web page, because several real factors move it. We would rather explain them so the quote you get on the phone makes sense.

Which chip the truck takes. A 4C key and a 4D-67 key are different parts, and that has to be settled first.
Whether you have a working key. Copying from an original is simpler than starting from nothing.
How many keys you want. Programming a second key during the same visit usually makes more sense than two separate trips.
Condition of the locks. A worn ignition or door lock can make a new key feel wrong even when it is cut correctly.
Where you are. A mobile van visit and a stop at our storefront are set up differently.

The part we cannot promise from a data sheet

Our data for this year is marked conflicting, and the 4D-67 chip is not independently verified. We would rather say that plainly than give you a confident answer that turns out wrong at the ignition. So we confirm by VIN or by looking at the key in person before cutting. If your existing key has a dot on the head, that is a useful clue, but it is a clue, not proof.

This also matters if you are buying a key from an online seller. A key listed for a 2003 4Runner may be the wrong chip for your particular truck, and a blank that does not match cannot be fixed by programming.

There is also the lock side. Common problems on this truck are worn ignition wafers on high-mileage examples and a worn key blade that no longer turns the lock. If a new key still sticks, the wear may be in the lock rather than the key, and we will tell you which it is. The truck also has a mechanical backup key, which is useful to know if you ever need to open it without the electronics.

Why call Wilshire Lock & Key for this

We have been in business since 1987, with a storefront at 10740 Wilshire Blvd in Westwood and mobile vans that come to you. It is one company, so you are not handed to a dispatcher who hands you to someone else. David, the owner and lead technician, oversees the work.

California requires locksmith companies to hold a BSIS LCO license, and you should ask any locksmith for it before they start. For more on this model across years, see our 4Runner key pages, the wider Toyota key service overview, or our full car key services. To book, use the contact page or call (213) 577-1366, answered 24 hours a day.

Frequently asked questions

Does a 2003 Toyota 4Runner have a push-to-start key?

No. It uses a transponder key with a metal blade that you turn in the ignition. The chip in the head has to be programmed to the truck for it to start.

Which transponder chip does a 2003 4Runner use?

It depends on the build. One source lists 4C through 2003 and 4D-67 from 2003, so both appear for this year. We confirm from the key stamp or VIN before cutting rather than guessing.

Will a hardware-store copy start my 4Runner?

No. A copy without a programmed transponder chip may open the door and turn the ignition, but it will not start the engine.

Can you make a key if I have lost every key?

Yes, all-keys-lost is possible for this truck. We use the VIN to identify the key, cut the blade, and program the new key through the OBD port.

Do I need to go to a dealer for a 2003 4Runner key?

Nothing in our data for this year makes it dealer-only, and the programming does not require NASTF SDRM access. We can handle it with our storefront or a mobile van.

My key goes in but barely turns. Is it the key or the lock?

Either can be the cause. Worn ignition wafers and a worn key blade are both common on high-mileage 4Runners. We check both and tell you which needs attention before replacing anything.

How do I know you are a legitimate locksmith?

Ask any locksmith for their California BSIS LCO license number before work begins. You can also call us at (213) 577-1366 with any questions about our process.

We cover all these cities

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

Last updated 2026-10-11.