How to program new BMW CAS4 keys with APP2 APPRO2 Key Programmer by OBD? No original key required! This step-by-step guide walks you through retrieving the CAS password, generating dealer keys and avoiding common pitfalls. Whether you’re a locksmith, mechanic or DIY enthusiast, follow these instructions for seamless key matching every time.
Software Update
The latest APPRO upgrade enables OBD key programming for CAS4 systems, including SM48H & 1N35H CPUs (2010–2019). Key features:
- OBD or programmer key generation
- "Load Password" function (V04+) — Input CAS password for faster access
- Five software refinements for smoother operation
Ideal for BMW diagnostics & key replacement.
How to program BMW CAS4/4+ keys by OBD?
Step 1: Obtain CAS Password
- CAS4 (EWS4): Password can be retrieved directly without the original key or engine ISN.
- CAS4+ (EWS5): Requires the original key or engine ISN to obtain the password.
- Force Enable Function: If only a disabled key is available, use APPRO2’s forced activation to retrieve the password.
- Backup Password: Always save the password file for emergencies.
Step 2: Generate Dealer Key
- Prepare a Blank Key: Match the vehicle’s frequency (check via "Key Information").
- Select a Blank Key Position: Avoid duplicates in the vehicle’s key list.
- Generate New Key:
- Click "Generate New Key" → Confirm.
- Hold the blank key near the steering column’s key area.
- Wait for success — new key ID will appear in the list.
Key Notes
- Reusable Keys: OBD-generated keys aren’t locked — can be reused on other vehicles.
- Avoid Duplicates: Delete old key IDs before regenerating for the same vehicle.
Tip: Save passwords and verify frequencies for smooth key matching!
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