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Lexus NX Key Replacement
Lexus NXs have been on Dallas–Fort Worth roads since the 2015 era, and across 1 key generation this model has used 1 different key system — 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 NX Keys
The table below is our verified key reference for the Lexus NX — 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 |
|---|---|---|---|---|
| NX | 2015–2021 | 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 NX specifically, the immobilizer families we see are: 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?
- 2015–2021: Smart Access proximity (push-button) — Texas DST-AES 128-bit (“H”, Page1 39) (TOY48 (insert))
Our NX Key Services
- Key replacement — lost, stolen or broken NX keys cut from code and programmed on-site, including all-keys-lost by VIN
- Spare key duplication — the cheap insurance; most NX 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 NX Key FAQ
I lost the only key to my NX. 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 NX call.
My NX is push-to-start. Can you really program that outside the dealer?
Yes. Late-model NXs (2015–2021) 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.
How fast can you reach my NX 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.