Car Key Replacement &
Programming Experts

Toyota and Lexus vehicles use a dedicated immobilizer (IMMO) system that stores a PIN code inside the ECU and the key's transponder chip. When all keys are lost, we must extract the IMMO data or PIN directly from the vehicle's computer before a new key can be cut and programmed.

• 1Connect diagnostic tool to OBD-II port and identify ECU/IMMO module
• 2Extract IMMO PIN code or read immobilizer data from the vehicle computer
• 3Cut a new mechanical blade to match the door/ignition lock
• 4Use PIN to program transponder chip or smart key to the vehicle
• 5Verify all programmed keys start the engine and trigger remote functions

BMW has used multiple generations of the CAS (Car Access System) and later FEM/BDC modules. Each generation requires a different tool, data-reading method, and ISN (Individual Serial Number) extraction approach. We cover all of them.

• 1CAS2 (E8x/E9x early): Read CAS2 module via OBD or direct chip; extract ISN and program new key via CAS2 procedure
• 2CAS3 / CAS3++ (E60/E90/E70 era): Read ISN from CAS3 or DME via OBD-II or bench; CAS3++ requires advanced seed/key calculation
• 3CAS4 (F10/F30/F15 era): ISN must be read directly from DME/MSD80 chip; requires CGDI BMW, Autel IM608 Pro, or equivalent
• 4FEM (Front Electronic Module — F20/F30 post-2012): FEM replaced CAS4 on many models; ISN read via OBD or FEM bench flash
• 5BDC / BDC3 (G-series — G30/G20/G05): BDC (Body Domain Controller) is the newest platform; requires BDC dump + ISN calculation via specialized tools
• 6Program new BMW comfort access key fob and verify all CAS/FEM/BDC functions

Nissan and Infiniti require that the key fob's FCC ID (Federal Communications Commission ID) is verified against the vehicle's VIN number before programming. A fob with a mismatched FCC ID cannot be paired to the BCM — the correct part must be used first.

• 1Verify vehicle VIN and cross-reference required FCC ID for correct key fob part
• 2Enter NATS (Nissan Anti-Theft System) registration mode via diagnostic tool
• 3Register all new key fobs to the BCM (Body Control Module)
• 4Program ignition transponder chip to the IMMU (Immobilizer Unit)
• 5Test start, remote lock/unlock, and panic functions

Honda vehicles use an immobilizer system built into the ECM. Programming a transponder key requires writing the key's seed code into the ECM. Older Hondas (pre-2000) use a 4-cut HON58 blade; newer models use HON66 10-cut.

• 1Identify blade profile (HON58 or HON66) and cut mechanical key
• 2Use OBD tool or key-learning device to enter ECM programming mode
• 3Write transponder seed code into ECM memory
• 4Program remote fob (if applicable) via separate Honda remote learning sequence

Ford uses the PATS (Passive Anti-Theft System) — also called SecuriLock. The PCM stores a list of registered transponder codes. Programming requires either two existing working keys (self-learn method) or a professional scan tool to bypass and register new keys directly.

• 1Determine PATS generation (PATS 1–6) based on year/model
• 2Connect Autel/J2534 tool to OBD and access PCM security menu
• 3Erase existing transponder codes and register new keys to PCM
• 4For newer Ford IKT (Intelligent Key Technology), sync via GEM module

General Motors has used multiple anti-theft systems: early VATS (Vehicle Anti-Theft System) with resistor pellet keys, then Pass-Key II/III transponder-based, and modern PKE (Passive Keyless Entry) push-button systems requiring BCM programming.

• 1VATS/Pass-Key II: Measure resistor value in key, match or relearn via BCM
• 2Pass-Key III+: Program transponder chip via OBD-II scan tool to BCM and PCM
• 3Modern PKE: Program smart key/fob via GM MDI or Tech2 equivalent
• 4Register all keys in BCM and verify theft deterrent module

Mercedes uses the EZS (Electronic Ignition Switch) and ESL (Electronic Steering Lock) system. Programming a new key requires synchronizing with the EZS, ESL, EIS, and in some cases the gearbox control unit — all modules must agree on the new key's authorization.

• 1Read current EZS data to determine key slots and current count
• 2Program new key via XENTRY/DAS or compatible Autel IM608 Pro
• 3Synchronize EZS, ESL, and gearbox (if applicable)
• 4For W204/W212+: also synchronize ESL module separately

Hyundai and Kia use the SMARTRA (Smart Transponder Authenticator) or SMK (Smart Key) module. Key programming requires entering a security access code via OBD-II. If all keys are lost, the SMARTRA module must be read or replaced and matched to the ECU.

• 1Connect to OBD-II and access SMARTRA / SMK module via scan tool
• 2Input security access code (obtained via immobilizer PIN read)
• 3Register new transponder key or smart key fob to module
• 4If all keys lost: SMARTRA data dump and PIN extraction required