- (214) 717-6398
- info@dfwkeys4cars.com
- Mon - Fri: 9:00 - 18:30
Audi S4 Key Replacement
Audi S4 keys date back to 1997 and span 4 key systems across the model’s generations — transponder; flip remote; flip / smart (comfort access); smart key (keyless go). DFW Keys 4 Cars cuts and programs every one of them at your location anywhere in Dallas–Fort Worth, 24/7 — spares, all-keys-lost, fobs and lockouts. Call (214) 717-6398.
About S4 Keys
Verified key reference for the Audi S4 — model years, key types, and the transponder/immobilizer each generation uses. Boundary years can overlap; we confirm the exact part by VIN before dispatching.
| Model / Generation | Years | Key Type | Transponder / Immobilizer | Blade / FCC |
|---|---|---|---|---|
| A4 · S4 | 1997–2003 | Transponder | Megamos Crypto ID48 | HU66 |
| A4 · S4 | 2004–2008 | Flip remote | Megamos Crypto ID48 (precoded) | HU66 |
| A4 · S4 · allroad | 2008–2016 | Flip / smart (Comfort Access) | Hitag-Extended VAG (PCF7945AC) | HU66 |
| A4 · S4 (B9) | 2017–2024 | Smart key (Keyless GO) | Megamos Crypto AES | HU162T |
Security System & Immobilizer
Audi spans Megamos ID48, the 8E era, Hitag-extended precoded keys, and Megamos AES on MLB/MQB platforms.
On the S4 specifically we see: Megamos Crypto ID48, Megamos Crypto ID48 (precoded), Hitag-Extended VAG (PCF7945AC), Megamos Crypto AES. A correctly cut but unprogrammed key turns the locks and never starts the engine — programming is the half of the job that matters.
Which key does your year have?
- 1997–2003: Transponder — Megamos Crypto ID48 (HU66)
- 2004–2008: Flip remote — Megamos Crypto ID48 (precoded) (HU66)
- 2008–2016: Flip / smart (Comfort Access) — Hitag-Extended VAG (PCF7945AC) (HU66)
- 2017–2024: Smart key (Keyless GO) — Megamos Crypto AES (HU162T)
Our S4 Key Services
- Key replacement — lost, stolen or broken keys cut from code and programmed on-site, including all-keys-lost by VIN
- Spare key duplication — cheap insurance done in one short visit
- Fob & transponder programming — remotes and smart keys paired to the immobilizer
- Lockout service — damage-free entry, 24/7
- Ignition repair — worn cylinders and keys that won’t turn
Audi S4 Key FAQ
I lost the only key to my S4. 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.
My S4 is push-to-start — can you program that outside the dealer?
Yes. Late models (2017–2024) use a proximity smart key on Megamos Crypto AES — we carry the fobs and the programmer, and we cut the emergency blade.
Do you still stock keys for older S4s?
Yes — back to the 1997–2003 generation (transponder), and a fresh code-cut key beats any copy of a worn original.
How fast can you reach my S4 in DFW?
We dispatch the nearest mobile unit metroplex-wide, 24/7 — call (214) 717-6398 for an honest ETA.