Airbag control unit with part number 4F0 910 655 Q

What is the function of the airbag control unit 4F0 910 655 Q?

The airbag control unit with part number 4F0 910 655 Q is the central control unit for the passive safety system in the Audi RS6 C6 and A6 C6. It processes data from the crash sensors and is responsible for precisely and reliably deploying the airbags, seatbelt pretensioners, and associated ignition circuits in the event of a collision.

As the “brain” of the restraint system, it continuously monitors all safety‑related components. It ensures communication between sensors and actuators to guarantee the protection of vehicle occupants.

This control unit is also known under related part numbers 4F0 959 655 B, 4F0 959 655 E, 4F0 959 655 G, as well as 4F0 910 655 E. Proper functionality is essential for vehicle safety.

Why does the control unit 4F0 910 655 Q fail?

A failure of the control unit 4F0 910 655 Q is most often caused by stored crash data following an accident, which locks the system. Other causes include internal software errors, communication malfunctions with other vehicle components, or electronic defects such as interruptions in the ignition circuits.

After a crash, the control unit permanently stores the crash event data. This lock is a safety feature and can often only be reset using specialized software, necessitating repair.

Electronic defects may also manifest themselves. A typical example is error code B1008, indicating an interruption in ignition circuit 2 of the front airbag. Such faults can arise from internal component aging or external influences.

Peripheral issues, such as cable breaks—e.g., due to seat adjustments on the seatbelt pretensioner—can also lead to persistent fault entries that cannot be cleared with standard diagnostic tools, suggesting the need for control unit repair.

How do you recognize a defect in the 4F0 910 655 Q?

A defective airbag control unit 4F0 910 655 Q primarily manifests as a permanently illuminated airbag warning light on the instrument cluster. Additionally, the control unit may no longer be accessible via the OBD2 interface and refuse communication with diagnostic equipment.

The most obvious sign is the airbag warning light, which fails to extinguish after the engine starts. This indicates a serious fault in the safety system that requires immediate inspection.

Another clear symptom is the inability to perform diagnostics. When a workshop attempts to read the fault memory, communication fails—the control unit does not respond to requests, preventing accurate fault analysis.

In some cases, communication is possible, but specific error codes—especially those referencing stored crash data—cannot be cleared. This is a definitive indication that the control unit requires professional repair.

In which vehicles is the control unit 4F0 910 655 Q installed?

The airbag control unit 4F0 910 655 Q is primarily designed for the Audi RS6 of the C6 generation. It is also installed in various models of the Audi A6 C6, including Avant variants. At Airbag24, we offer expert repair services for these specific vehicles.

At Airbag24, we repair the control unit 4F0 910 655 Q and compatible variants for the following Audi models:

Audi RS6 C6 (model years 2008–2010)

Audi A6 C6, including Avant (model years 2004–2011)

How does the repair of the 4F0 910 655 Q proceed at Airbag24?

Upon sending the removed control unit to Airbag24, a comprehensive electronic analysis is performed. Our technicians restore the device to like-new condition by professionally erasing crash data and repairing internal faults. No re‑coding is required after the repair.

For expedited processing, we recommend reading the fault memory before removal and attaching the shipment’s diagnostic report. This enables our technicians to conduct targeted diagnosis and repair.

The core of the repair involves eliminating the root cause of the fault. This includes resetting the internal memory when crash data is stored or repairing the circuit board in case of electronic defects. We use specialized software and high‑quality components.

Following successful repair and final testing, the control unit is returned ready for installation. It can be directly reinstalled in the vehicle (plug-and-play) and functions just like a new part. We provide 2 years' statutory liability for defects on every repair.