Airbag control unit with part number 2Q0 959 655 AF

What does the airbag control unit 2Q0 959 655 AF do?

The airbag control unit 2Q0 959 655 AF is the central control unit of the restraint system (SRS) for Audi. It evaluates the crash sensors, decides in an accident which airbags and seatbelt pretensioners trigger, and monitors the system continuously.

The manufacturer's number Bosch 0285014729 is also printed on the housing. Both details come from the same unit.

The decision on triggering is made by the unit in fractions of a second. It shows faults via the airbag warning light. After an accident it stores crash data and locks itself, and the lock is only lifted by the repair.

Why does the control unit 2Q0 959 655 AF fail?

The most common cause is crash data stored after an accident, even without a triggered airbag. In addition, aged components, moisture, corrosion and voltage spikes come into question.

Crash data remain in the unit until they are deleted during the repair. A normal diagnostic tool does not delete them.

• Aged electronic components
• Cold solder joints that can come loose over time
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump starting

How can you tell that the 2Q0 959 655 AF is defective?

You recognise a defect on the 2Q0 959 655 AF by an airbag warning light that stays on permanently or intermittently, by error messages in the instrument cluster, by a missing connection to the diagnostic tool or by a fault memory that cannot be cleared.

In this case airbags and seatbelt pretensioners may possibly not trigger in an emergency. The cause must therefore be clarified promptly.

• Airbag warning light in the instrument cluster, permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool without connection to the control unit
• Fault memory that cannot be cleared

Such signs concern the protection system itself and must therefore be taken seriously.

Which vehicles is the 2Q0 959 655 AF fitted in?

The 2Q0 959 655 AF is fitted in these vehicles: Audi A1 GB (from 2018).

The vehicles that belong to this part number are in the list:

• Audi A1 GB (from 2018)

A comparison of the part number on the label with this page only confirms that it is the right unit. Whether the control unit is defective or a plug or cable is the cause is shown by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 2Q0 959 655 AK, 2Q0959655AC.

How does the repair of the 2Q0 959 655 AF work?

First have the fault memory read out and attach the log; then disconnect the battery. Only then remove the control unit and create a repair order online.

Processing at Airbag24 usually takes 3–4 working days. You then send in the well-packed unit.

Airbag24 checks the unit on the test bench, reworks defective components, deletes the stored crash data and carries out a function test. Afterwards your own unit comes back to you.

Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit 2Q0 959 655 AF get to Airbag24?

You send the control unit 2Q0 959 655 AF as a parcel or book a UPS collection for an extra charge. After the repair you receive the unit back by UPS.

Pack the unit shock-proof and enclose the printed repair order.