The 2024–2025 Sonata uses the same key setup, so everything on this page applies to those years too. The full picture is on the Hyundai Sonata key guide.
2025 Hyundai Sonata: key facts
- Key type
- Smart / proximity key
- Push-to-start
- Yes
- Transponder chip
- 4A (Hitag AES)
- Programming
- OBD
- All keys lost
- We can originate new keys on site
Facelifted DN8: fobs move to Hitag-AES 4A (TQ8-FOB-4F89U44). Aftermarket tools report good 4A coverage, but all-keys-lost support is still maturing — confirmed per job.
Same key system as the 2024–2025 Sonata
Hyundai kept the Sonata's key system unchanged across 2024–2025, so everything about replacing a 2025 key — blanks, programming, and what happens if every key is lost — matches the rest of that run. The full year-by-year breakdown lives in our Hyundai Sonata key guide.
What drives the price is the key type, whether you still have a working key, and where the car is parked. There's more on Hyundai programming in general on our Hyundai key page.
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Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.