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Wilshire Lock & Key

2026 Kia Optima (K5 since 2021) · key facts verified · 24/7

2026 Kia Optima key replacement

The 2026 Kia Optima uses a smart proximity fob using the 4A (NXP Hitag AES) chip family — the same key setup Kia ran from 2025–2026. We cut and program replacements at your location across LA and Ventura counties, day or night. Call (213) 577-1366 and we confirm your exact key by VIN before we roll.

Call (213) 577-1366Optima (K5 since 2021) — all years
  • Since 1987
  • Westwood storefront + mobile vans
  • A person answers, day or night

The 2025–2026 Optima (K5 since 2021) uses the same key setup, so everything on this page applies to those years too. The full picture is on the Kia Optima (K5 since 2021) key guide.

2026 Kia Optima (K5 since 2021): key facts

Key type
Smart / proximity key
Push-to-start
Yes
Transponder chip
4A (NXP Hitag AES)
Programming
OBD
All keys lost
Depends on trim — call to confirm

K5 facelift era: catalogs (transpondery.com) still list the 4A Hitag-AES smart system through 2026, but we confirm the fob part number and current all-keys-lost tool coverage per job. OBD programming; a Kia PIN may be required.

Same key system as the 2025–2026 Optima

Kia kept the Optima's key system unchanged across 2025–2026, so everything about replacing a 2026 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 Kia Optima 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 Kia programming in general on our Kia key page.

We cover all these cities

Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.

Last updated 2026-10-11.

Need a key for your 2026 Kia Optima (K5 since 2021)?

We answer around the clock, every day of the year.

Call (213) 577-1366
Call Now: 24/7 — (213) 577-1366