Subaru Ascent 1st generation (2019–2026) — Key Programming Reference
- Difficulty
- medium
- Lishi / lockout
- TOY43AT
Key fobs & transponder keys (2 variants)
| Key | Years | FCC ID | P/N | Chip | Freq | Battery | Blade |
|---|---|---|---|---|---|---|---|
| 433.92 MHz · HYQ14AHK | 2019–2022 NA (US + Canada), all trims | HYQ14AHK | 88835-FL03A | Texas H 8A (DST-AES, 128-bit) | 433.92 MHz | CR2032 | TOY51 |
| 433.92 MHz · HYQ14AKB | 2022–2026 NA (US + Canada), all trims; also 2021–2026 Subaru Evoltis (Philippines / South America / Israel) | HYQ14AKB | 88835XC00A | Texas H 8A (DST-AES, 128-bit) | 433.92 MHz | CR2032 | TOY51 |
Programming procedures
What the job needs
- Add a key: 1 existing working key required.
- All keys lost: no existing working key needed.
- PIN / security code: No PIN required.
- Online / server access: not required (offline programming).
- On-board (no tool) sequence: not available — Subaru Texas DST-AES 8A smart key IMMO requires OBD diagnostic tool.
- On site: engine off · Maintain 12V+ · Clear IMMO/BCM DTCs.
- Bring: Photo ID + vehicle registration.
Tool coverage
Documented for this case on: Autel IM608 Pro II · Autel IM508S · Autel KM100 · Xhorse Key Tool Plus · Xhorse Key Tool Max Pro · Lonsdor K518 Pro / K519 · OBDSTAR X300 DP Plus · AutoProPad G2/G3 · Advanced Diagnostics Smart Pro · Launch X431 IMMO Elite / IMMO Plus. Step-by-step menu paths for each tool are in the app.
Notes & cautions
- No external PIN required for Subaru Texas DST-AES 8A add key. Autel/Smart Pro reads IMMO data internally via OBD.
- No internet required for Autel add key on Subaru Texas DST-AES 8A. Smart Pro ADS2255/ADS2330 requires WiFi for AD server.
- Subaru smart system limit: maximum 4 keys per vehicle. If 4 already programmed, one must be erased before adding new key.
- No external PIN required for Subaru Texas DST-AES 8A AKL.
- No internet required for Autel + APB112 AKL on Subaru Texas DST-AES 8A. Smart Pro requires WiFi for AD server.
- Subaru AKL on G-key / 8A proximity requires APB112 simulator (Autel) OR ADC2015 emulator cable (Smart Pro). Verify tool + accessory before scheduling.
- Min 2 new smart keys recommended for AKL.
- AKL erases all existing key registrations — any lost keys will not be retrievable.
Lockout
Door pick / decode: Lishi TOY43AT (CW).
42 verified sources · Last verified: 2026-08-09
Open full case in KeyAssist →Step-by-step tool menu paths, verified source links and video guides for this case are in the KeyAssist app — free to start, works offline.