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Lexus RX Key Replacement
Lexus RXs have been on Dallas–Fort Worth roads since the 1999 era, and across 4 key generations this model has used 3 different key systems — transponder ignition key; transponder / remote-head key; smart access proximity (push-button). Whichever yours is, DFW Keys 4 Cars cuts and programs it at your location, 24/7: spare keys, lost-everything replacements, fob programming, and lockouts. Call (214) 717-6398.
About RX Keys
The table below is our verified key reference for the Lexus RX — model years, key types, and the transponder/immobilizer family each generation uses. Generations overlap at boundary years, and trim levels (keyed vs. push-to-start) can differ within the same year, so we always confirm the exact part by VIN before dispatching.
| Model / Generation | Years | Key Type | Transponder / Immobilizer | Blade / FCC |
|---|---|---|---|---|
| RX | 1999–2003 | Transponder ignition key | Texas ID 4C | TOY40 |
| RX | 2004–2009 | Transponder / remote-head key | Texas Crypto 4D (4D68, DST80 “G”) | TOY48 |
| RX | 2010–2015 | Smart Access proximity (push-button) | Texas Crypto 4D (4D68, DST80 “G”) | TOY48 (insert) |
| RX | 2016–2022 | Smart Access proximity (push-button) | Texas DST-AES 128-bit (“H”, Page1 39) | TOY48 (insert) |
Security System & Immobilizer
Lexus shares Toyota’s immobilizer lineage — 4C, 4D67, G and H transponder eras — topped by the Smart Access proximity system on push-to-start models. Luxury badge, familiar engineering: all of it programs on-site with the right tools.
On the RX specifically, the immobilizer families we see are: Texas ID 4C, Texas Crypto 4D (4D68, DST80 “G”), Texas DST-AES 128-bit (“H”, Page1 39). A key that is cut correctly but not programmed to this system will turn the locks and never start the engine — programming is the half of the job that matters.
Which key does your year have?
- 1999–2003: Transponder ignition key — Texas ID 4C (TOY40)
- 2004–2009: Transponder / remote-head key — Texas Crypto 4D (4D68, DST80 “G”) (TOY48)
- 2010–2015: Smart Access proximity (push-button) — Texas Crypto 4D (4D68, DST80 “G”) (TOY48 (insert))
- 2016–2022: Smart Access proximity (push-button) — Texas DST-AES 128-bit (“H”, Page1 39) (TOY48 (insert))
Our RX Key Services
- Key replacement — lost, stolen or broken RX keys cut from code and programmed on-site, including all-keys-lost by VIN
- Spare key duplication — the cheap insurance; most RX spares are done in one short visit
- Fob & transponder programming — remotes, fobiks and smart keys paired to the immobilizer, including proximity fobs
- Lockout service — damage-free entry when the keys are inside, 24/7
- Ignition repair — worn cylinders and keys that won’t turn
Lexus RX Key FAQ
I lost the only key to my RX. What now?
We come to the vehicle, verify ownership, cut a new key from the VIN, and program it on-site. No tow, no dealer wait — this is our most common RX call.
My RX is push-to-start. Can you really program that outside the dealer?
Yes. Late-model RXs (2016–2022) use a proximity smart key on the Texas DST-AES 128-bit (“H”, Page1 39) system — our trucks carry the fobs and the programmer. We cut the emergency blade too.
My RX is older — do you still stock keys for it?
Yes. We carry blanks and chips going back to the 1999–2003 generation (transponder ignition key), and a code-cut fresh key usually turns a worn lock better than any copy of your worn key.
How fast can you reach my RX in DFW?
We dispatch the nearest mobile unit across the whole metroplex, 24/7. Call (214) 717-6398 with your location and we’ll give you an honest ETA.