Source: Lonsdor Official — August 12, 2026
Lonsdor has shipped a new software release for the K518 Pro that adds spare smart key programming for 2025–2026 Toyota and Lexus vehicles equipped with the 4A B6 smart key system. For locksmiths, this closes one of the most requested gaps in the aftermarket: adding a second key to late-model Toyota and Lexus vehicles without a dealership visit or a full all-keys-lost teardown.
What the August Update Actually Covers
The release is narrowly scoped but high-value. It targets Toyota and Lexus models built for 2025 and 2026 that run the 4A B6 smart key architecture — the successor to the 8A B6 system that has dominated the platform for years. Unlike the earlier 8A B6 keys, the 4A B6 generation tightens several security checks, which is exactly why it has been slow to reach the independent aftermarket.
Within the update, Lonsdor exposes four functions that map directly to how a locksmith actually works:
- Key Counting — read the current number of active keys registered to the vehicle.
- Data Security — back up the IMMO data before programming, so a failed write can be rolled back safely.
- Key Management — add a spare smart key or delete a lost key.
- Module Sync — register the ECU and ID code box so the new key is recognized across the vehicle.
The menu path is Immo & Remote → Toyota → Select type → PEPS → Type 11 (CAN) (2025-) → 2025- (4A B6). Adding a spare smart key costs 35 tokens — the same rate Lonsdor charges for the older 8A B6 keys, so shops are not paying a premium for the newer platform.
Why Toyota and Lexus 4A B6 Matters to Locksmiths
Toyota and Lexus are the highest-volume key-programming market in most regions, and the 4A B6 transition has been a quiet but significant headache. As 2025 and 2026 models roll into the independent bay, technicians who could previously clone or add a key in minutes are hitting a wall because the new system refuses tools that only understand the older 8A B6 protocol.
The shift is not cosmetic. The 4A B6 platform reworks the way the smart key authenticates against the vehicle's PEPS (passive entry/passive start) controller and ID code box, which means the older 8A B6 routines that thousands of shops relied on simply do not talk to the new hardware. A tool that "supports Toyota smart keys" is not enough — it has to support the specific 4A B6 generation, which is why a dedicated, versioned update like this one carries real weight in the shop.
The practical consequence is a lost revenue stream. A spare-key job that once took ten minutes becomes a referral to the dealer — or a full AKL (all-keys-lost) job that requires opening the vehicle, reading the IMMO box, and far more labor. This update matters because it lets a shop capture the simple, high-margin "add a second key" work again, without investing in a different platform.
It also matters for safety. The Data Security function is not a marketing bullet — backing up IMMO data before any write is the difference between a clean job and a bricked module when a battery drops or a write is interrupted mid-session. That rollback capability is what separates professional-grade tools from hobbyist clones.
What You Need in Your Kit
This workflow runs on the Lonsdor K518 Pro and K518 series. If your bench is set up around smart key programming, the supporting hardware matters as much as the software. A proper auto key programmer is the core, but you will also need the right blank remotes and chips for the vehicle in front of you.
Stocking the correct car remote keys and car key chips for Toyota and Lexus means you can complete the job the moment the vehicle arrives, rather than ordering parts after the fact. For shops that run Lonsdor hardware, keeping the platform current through the original Lonsdor products range ensures the token-based functions activate cleanly. And for the all-keys-lost jobs that 4A B6 will still generate, a well-equipped auto locksmith tool setup rounds out the bench.
One detail worth noting for shop economics: because spare-key programming runs through the vehicle's diagnostic CAN channel rather than a bench teardown, the 35-token cost is the only incremental expense on top of the blank remote and blade. For a typical "customer lost one key, wants a backup" job, that keeps the service affordable while the shop still clears healthy margin — which is precisely the kind of work that keeps a locksmith's schedule full between larger AKL projects.
What to Expect Next
Lonsdor has been shipping Toyota and Lexus coverage in steady increments — the 8A B6 support was added earlier, and this 4A B6 release follows the same pattern. Expect the next updates to broaden the 4A B6 vehicle list and, eventually, to move from spare-key programming toward full AKL support on the newest Toyota and Lexus platforms.
The broader takeaway is about where the aftermarket is heading. Each new smart-key generation arrives with tighter security, and the gap between dealership tools and independent options widens until a manufacturer like Lonsdor ships a targeted update. Shops that keep their key programmers updated — and their blank inventory stocked — are the ones that keep capturing Toyota and Lexus work as the fleet turns over to the 2025–2026 model years.
Written by Roberto Vargas, Key Programming & ECU Specialist at vxdas.com
