Airbag control unit with part number 1EA 959 655 FE

What does the airbag control unit 1EA 959 655 FE do?

The airbag control unit 1EA 959 655 FE is the central control of the restraint system (SRS) in Cupra. It processes the signals from the crash sensors, determines in a crash within milliseconds which airbags and seatbelt pretensioners are triggered, and checks the system continuously. After an accident, it stores crash data and locks itself.

If the system reports a fault, the airbag warning light in the instrument cluster lights up.

The lock is only lifted by the repair.

Why does the control unit 1EA 959 655 FE fail?

The most common cause of the 1EA 959 655 FE failing is crash data stored after an accident, even if no airbag has triggered. Further causes are aged components, moisture and corrosion on plug connections, and voltage spikes, for example with a weak battery.

Crash data stored after an accident remains in the unit, and a standard diagnostic scanner cannot remove it.

Aged components, cold solder joints and moisture in the area of the plug connections can also lead to failures. Voltage spikes, for example from jump-starting, are an additional cause.

On 1EA control units, such an internal defect cannot be repaired. For these units, Airbag24 offers only the erasure of stored crash data.

How can you tell that the 1EA 959 655 FE is defective?

A defect on the 1EA 959 655 FE shows through the airbag warning light, which lights up permanently or intermittently, through fault messages in the instrument cluster, through a missing connection to the diagnostic tool, or through a fault memory that cannot be erased.

The typical signs at a glance:

• Warning light in the instrument cluster stays on permanently or only lights up intermittently
• Messages in the instrument cluster about the airbag system
• Diagnostic tool does not establish a connection to the control unit
• Fault memory remains even after an attempt to erase it

If you notice any of these signs, have the fault memory checked promptly. In an emergency, airbags and seatbelt pretensioners may fail to trigger.

Which vehicles is the 1EA 959 655 FE fitted in?

The 1EA 959 655 FE is fitted in these vehicles: Cupra Leon KL (2020-2023) and KL Facelift (from 2024).

This list shows the vehicles:

• Cupra Leon KL (2020-2023)
• Cupra Leon KL Facelift (from 2024)

Compare the part number on the label of the removed unit with this page. That only establishes that you have the right unit. Before sending it in, have the fault memory read out: the log shows whether the control unit is defective or whether a plug or cable is the cause. If B2000 ("control unit defective") appears, no repair is possible, and you then do not send the unit in.

For the same vehicles, we also repair control units with the part numbers 1EA 959 655 DQ, 1EA 959 655 EP, 1EA 959 655 FB.

How does the repair of the 1EA 959 655 FE work?

You first have the fault memory read out and enclose the log. Then disconnect the battery and only after that remove the control unit 1EA 959 655 FE. Next, create a repair order online and send in the unit well packed.

Airbag24 checks the unit on the test bench, erases the stored crash data and carries out a function test. Processing usually takes 3–4 working days. Your own unit is then sent back.

If fault B2000 is stored, no repair is possible for control units with a 1EA part number.

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 1EA 959 655 FE get to Airbag24?

The way to Airbag24 is either a parcel that you send yourself or a UPS collection that you book for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Put the printed repair order into the parcel, and the unit is packed shockproof.