VAG Sync Calculator

Forward Mode: Enter IMMO and ECU, optionally TCU and/or ELV. Click "Calculate Sync" to generate the sync bytes.

Reverse Mode: Enter Sync and IMMO. Click "Reverse Calculate" to recover ECU, TCU, ELV values. ⚠️ Experimental — under testing.

Notes:

• All values are 32 hex characters (16 bytes)
• TCU must be active to include TCU in calculation
• ELV must be active to include ELV in calculation
• The sync output is exactly 32 bytes
• Download creates a .bin file with raw bytes