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The primary Mercedes-Benz part number for the airbag control unit is A221 820 09 85
B1070 → Control unit software error → An error in the internal software of the airbag control unit was detected
as only the OEM part 4N0959655K (or 4N0 959 655 K) is validated for the Audi A6 C8 from 2018 onwards and ensures compatibility
Using the correct original part number is crucial for the safety and compatibility of the repaired system
An internal memory full or an EEPROM error can also lead to failure
Mercedes-Benz EQB X243 Airbag-Steuergerät Reparatur Reparatur The primary Mercedes-Benz part numberWhat is a Mercedes Benz EQB X243 airbag control unit? The Mercedes Benz EQB X243 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It monitors sensors, stores crash data, and ensures the proper functioning of all airbag modules in the vehicle, which is crucial for your safety. As the heart of the Supplemental Restraint System (SRS), it processes input signals from collision
