Airbag control unit with part number 8K0959655F

What does the airbag control unit 8K0959655F do?

The airbag control unit 8K0959655F coordinates the restraint system (SRS) at Audi. It evaluates what the crash sensors report and, in an accident, determines within milliseconds which airbags and seatbelt pretensioners are triggered. The condition of the whole system is monitored continuously, and faults appear on the airbag warning light.

During driving, the unit works unobtrusively in the background and constantly checks its connections.

After an accident, it stores crash data and locks itself.

Why does the control unit 8K0959655F fail?

The most common cause is stored crash data, even if no airbag was triggered. A normal diagnostic tool cannot erase it. Other causes lie in the electronics itself, in the connections and in the power supply.

The other causes at a glance:

• Aged electronic components
• Cold solder joints in the unit
• Moisture and corrosion at plug connections
• Voltage spikes from a weak battery or jump start

How can you tell that the 8K0959655F is defective?

A defect becomes visible through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. An error message in the instrument cluster, a diagnostic tool without connection to the control unit, or a fault memory that cannot be erased also point to it.

As long as this condition persists, airbags and seatbelt pretensioners may possibly not deploy in an emergency. The warning light should therefore be taken seriously, as it signals a fault in the restraint system.

Have the finding checked promptly rather than ignoring the warning light.

Which vehicles is the 8K0959655F fitted in?

This concerns Audi and exactly this control unit. It is fitted in these vehicles: Audi A5 8TA Sportback Facelift (2011-2016), 8TA Sportback (2007-2011), 8T (2007-2011) and 8T Facelift (2011-2016).

The vehicles are listed individually here:

• Audi A5 8TA Sportback Facelift (2011-2016)
• Audi A5 8TA Sportback (2007-2011)
• Audi A5 8T (2007-2011)
• Audi A5 8T Facelift (2011-2016)

Compare the part number on the label of the removed unit with this page. This only confirms that you have the correct unit. Before you remove anything, therefore, have the fault memory read out. Only the log shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 5WK43749, 5WK44637, 8K0 959 655, 8K0 959 655 B, 8K0 959 655 J, 8K0 959 655 K.

How does the repair of the 8K0959655F work?

Have the fault memory read out and enclose the log before you disconnect the battery. Only then remove the control unit and create a repair order online. Testing, repairing and checking at Airbag24 usually takes 3–4 working days.

Then send the unit in well packed. Airbag24 tests it on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards the unit goes 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 8K0959655F get to Airbag24?

You send the unit in as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

Put the printed repair order in the parcel and pack the unit shockproof.