Airbag control unit with part number 5Q0959655BF

What is the function of the airbag control unit 5Q0959655BF?

The airbag control unit with part number 5Q0959655BF is the central control module for the occupant protection system in the Audi Q3 F3 (2018–2025). It processes data from crash sensors and is responsible for precisely and reliably deploying airbags, seatbelt pretensioners, and other safety‑related components in the event of a collision.

As a safety‑critical component, it continuously monitors the functionality of all connected restraint system components. Any irregularity is immediately detected and indicated by activating the airbag warning light on the instrument cluster.

The device’s modular electronics enable targeted diagnosis and repair. However, following a collision or an internal fault, professional restoration is essential to ensure passenger safety.

Why does the control unit 5Q0959655BF fail?

The most common failures of the control unit 5Q0959655BF are stored crash data after an airbag deployment, which can lock the unit. Other causes include internal electronic defects in components such as sensors or capacitors, leading to persistent error messages and a lit airbag warning light.

A typical symptom is the storage of crash data in the internal memory. After an accident, the unit locks to prevent further use, even if the vehicle has otherwise been repaired. This condition often cannot be cleared via standard OBD2 diagnostics.

A frequently encountered error code indicating an internal defect is B2000 00 (control unit failure). This code signals a problem on the circuit board that requires component‑level repair and cannot be resolved simply by clearing the error.

Related part numbers such as 5Q0959655CC and 5Q0959655BQ often exhibit similar failure patterns and are likewise affected by these typical issues.

How do you recognize a defect in the 5Q0959655BF?

The clearest sign of a defect in the control unit 5Q0959655BF is the permanently illuminated airbag warning light on the dashboard. Specific error codes like B2000 00 can often be read out using standard diagnostic tools but cannot be cleared, indicating a serious internal fault.

The airbag warning light fails to turn off after starting the vehicle, alerting the driver that the entire restraint system is non‑functional and would not deploy airbags in the event of a crash.

During workshop diagnostics, the fault memory cannot be erased. Even after attempting to clear the errors, the entry reappears immediately, suggesting either a blockage caused by stored crash data or a hardware defect.

In which vehicles is the control unit 5Q0959655BF installed?

The airbag control unit 5Q0959655BF is specifically designed for the second‑generation Audi Q3 (F3 series). At Airbag24, this control unit and its variants are professionally repaired for all models of this vehicle platform produced between 2018 and 2025.

At Airbag24, we service part number 5Q0959655BF for the following specific model:

Audi: Q3 (F3 type, model years 2018–2025)

Since related part numbers 5Q0959655CC and 5Q0959655BQ are also used in this model, repairs are available for these variants as well.

How is the control unit 5Q0959655BF professionally repaired?

Repair of the control unit 5Q0959655BF at Airbag24 includes a comprehensive analysis on a test bench, professional erasure of crash data, and replacement of defective electronic components. Following successful restoration and a final test, the unit is fully functional and ready for installation.

After sending the removed control unit to Airbag24, a thorough initial inspection is performed. This involves reading out error codes stored in the fault memory and analyzing the hardware on the circuit board.

The core of the repair lies in irreversibly removing the stored crash data at the hardware level. If additional electronic components such as capacitors or sensors are defective, they are replaced with new, high‑quality parts.

Following repair, the unit undergoes testing on a specialized test bench to verify full functionality. The control unit then behaves just like a brand‑new component. Thanks to professional restoration, no re‑coding in the vehicle is required, greatly simplifying reinstallation. Two years' statutory liability for defects is provided for the completed repair.