Airbag control unit with part number 5QF 959 655 BQ

What is the function of the airbag control unit 5QF959655BQ?

The airbag control unit with part number 5QF959655BQ is the central control module for the entire restraint system (SRS – Supplemental Restraint System) in the Audi Q2 of the GA series. It processes signals from impact sensors and coordinates, in the event of a crash, the deployment of airbags and seatbelt pretensioners to ensure occupant safety.

Technically, this device acts as the brain of the safety system. It continuously monitors all connected components—such as airbag modules, seatbelt pretensioners, seat occupancy mats, and crash sensors—for proper functionality.

The OEM part number 5QF959655BQ is specific to the Audi Q2 GA, produced from 2016 onward and in its facelift models, ensuring that all system-relevant data is processed correctly.

Why does the control unit 5QF959655BQ fail?

The most common cause of failure for the control unit 5QF959655BQ is the storage of crash data after a traffic accident. In such cases, the unit becomes internally “crash-locked” and reports errors like B2000 or 65535. Other causes include internal electronic malfunctions, broken wiring, or defective connectors to the SRS system.

Following an airbag deployment, the control unit locks itself for safety reasons. This condition cannot be cleared using standard workshop diagnostic tools and requires specialized repair.

Even without an accident, defects can occur. Peripheral issues, such as faulty wiring or corroded connectors, may lead to internal malfunctions or communication problems necessitating repair.

It’s important to distinguish this control unit from similar VAG part numbers, such as 5Q0959655BE (used in VW models) or 5QF959655BP (for the VW Arteon). Each part number demands a specific approach during repair.

How do you recognize a defect in the 5QF959655BQ?

A defect in the control unit 5QF959655BQ primarily manifests as the airbag warning light remaining constantly illuminated on the instrument cluster. Often, the control unit can no longer be accessed via a diagnostic tool, or it displays specific, non‑erasable error codes such as B2000 (control unit fault).

The most noticeable sign is the red airbag warning light that fails to turn off after the engine starts. This indicates a critical fault in the restraint system, compromising airbag functionality.

Another clear symptom is when a professional workshop cannot establish a connection to the airbag control unit using an OBD scanner. The unit no longer responds to diagnostic requests, pointing to a severe internal malfunction.

In which vehicles is the 5QF959655BQ installed?

The airbag control unit with part number 5QF959655BQ is exclusively fitted in the Audi Q2 of the GA series. This includes both the original models from 2016 and the facelift versions starting in 2020. At Airbag24, we specialize in repairing this specific control unit for all Audi Q2 variants.

At Airbag24, we service part number 5QF959655BQ for the following models:

Audi: Q2 (GA, 2016–2020), Q2 (GA Facelift, from 2020)

How is the 5QF959655BQ professionally repaired?

During professional repair at Airbag24, technicians inspect the internal electronics for hardware defects, check wiring and connectors, and perform a comprehensive functional test after repair. You receive 2 years’ statutory liability for defects on the restoration. With this control unit, erasing the crash data is often not possible. If the crash data needs to be erased, please contact us briefly before sending the unit in – we will check your part number.

After removal and shipment to Airbag24, the control unit undergoes a thorough incoming inspection. Using specialized diagnostic software, stored error and crash data are read out and analyzed.

Unlike replacing the unit entirely, the repair preserves all vehicle‑specific configurations, eliminating the need for time‑consuming reprogramming.

If necessary, defective electronic components—such as those supplied by Bosch—are expertly replaced during the repair. Finally, the system is calibrated to ensure full functionality.

Is repairing the 5QF959655BQ worthwhile?

Yes, repairing the 5QF959655BQ is an economically and technically sensible alternative to costly replacement. Compared to a new unit, often priced over €200, repairs save significantly. Moreover, the repair is sustainable, preserving the original coding and avoiding unnecessary programming effort at the workshop.

The biggest advantage lies in the substantial cost savings. Repairing the unit is significantly cheaper than purchasing a new control module directly from the manufacturer, without compromising on safety or functionality.

Since the original control module is repaired, all vehicle-specific data and coding remain intact. After repair, the unit can typically be reinstalled with ease, saving both workshop costs and time.

With 2 years’ statutory liability for defects on the completed repair, Airbag24 offers a safe and reliable solution to restore your vehicle’s restraint system to full working order.