Airbag control unit with part number 2Q0 959 655 AH

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

The airbag control unit 2Q0 959 655 AH is the central control unit of the restraint system for Audi. It processes the signals from the crash sensors, determines within fractions of a second whether airbags and seatbelt pretensioners are triggered in an accident, and continuously checks the system for faults.

The manufacturer's part number Bosch 0285014762 is also printed on the housing. The unit reports detected faults via the airbag warning light in the instrument cluster.

After an accident, the control unit stores crash data and locks itself. A reported fault is therefore worth checking promptly.

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

The most common cause is stored crash data after an accident, even if no airbag has deployed; a standard diagnostic tool cannot erase it. Other causes that may also apply to the 2Q0 959 655 AH are ageing components, soldered joints, moisture on contacts and voltage spikes in the vehicle electrical system.

Crash data is stored after an accident regardless of whether a seatbelt pretensioner or an airbag actually fired. A standard diagnostic tool cannot reach it to erase it.

In addition, the following causes are possible:

• wear and ageing of the electronic components
• poorly soldered points on the circuit board
• moisture and rust at plug connections
• voltage spikes from the vehicle electrical system, for example with a weakened battery

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

The airbag warning light in the instrument cluster lights up on the 2Q0 959 655 AH and indicates a fault. Other signs include a fault message in the instrument cluster, no connection to the control unit, and a fault memory that cannot be cleared.

The warning light may stay on permanently or only intermittently. In either case, airbags and seatbelt pretensioners may not trigger in an emergency.

The warning concerns the entire restraint system, even if the vehicle behaves completely normally in everyday use.

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

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

The fitment covers these models:

• Audi A1 GB (from 2018)

Compare the part number on the label of the removed unit with this page, as this only confirms that you have the correct unit. Have the fault memory read out beforehand, because only the log shows whether the control unit itself is defective or whether a plug or a cable is the cause.

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 AH work?

First have the fault memory read out and attach the log. Then disconnect the battery and only after that remove the control unit. Next, create a repair order online and send in the well-packed 2Q0 959 655 AH.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days, after which your own unit is returned 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 AH get to Airbag24?

You send the control unit 2Q0 959 655 AH as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant.