Airbag control unit with part number 8W0 959 655 M

What does the airbag control unit 8W0 959 655 M do?

The airbag control unit 8W0 959 655 M is the central control unit of the restraint system in vehicles from Audi. It evaluates the crash sensors and decides in an accident whether airbags and seatbelt pretensioners are triggered.

The unit monitors the system continuously and reports faults via the airbag warning light. After an accident it stores crash data and locks itself. Only the repair lifts the lock. The manufacturer's part number Bosch 0285014793 is also printed on the housing.

Why does the control unit 8W0 959 655 M fail?

The most common cause with the 8W0 959 655 M is crash data after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase this data.

Other causes are:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

Airbag24 erases the crash data during the repair.

How can you tell that the 8W0 959 655 M is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently as soon as something is wrong with the 8W0 959 655 M. In addition, a fault message appears in the instrument cluster, there is no connection to the diagnostic tool, and a fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. If you notice such signs, have the system checked promptly.

Which vehicles is the 8W0 959 655 M fitted in?

The 8W0 959 655 M is fitted in these vehicles: Audi RS4 B9 8W (2017-2024); Audi A4 B9 8W (2015-2019) and B9 8W Facelift (2019-2024).

For the part number, these vehicles are recorded in our database:

• Audi RS4 B9 8W (2017-2024)
• Audi A4 B9 8W (2015-2019)
• Audi A4 B9 8W Facelift (2019-2024)

Compare the part number on the label of the removed unit with this page. This only ensures that the correct unit is at hand.

Also have the fault memory read out. Only this result shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 28501194, 5WK43749, 8W0 959 655, 8W0 959 655F, 8W0959655A, 8W0959655H.

How does the repair of the 8W0 959 655 M work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the 8W0 959 655 M. Then create the repair order online and send in the well-packed unit. At Airbag24 itself, checking, repairing and testing usually take 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and carries out a functional test. Afterwards 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 8W0 959 655 M get to Airbag24?

You send the 8W0 959 655 M in as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back by UPS after the repair.

The printed repair order goes into the parcel, and you pack the unit shock-proof.