Airbag-Steuergerät mit der Teilenummer 99680308902 P20

What is the function of the airbag control unit 99680308902 P20?

The airbag control unit 99680308902 P20 is the central control module for the occupant protection system in the Porsche Boxster of the 986 series. It processes signals from crash sensors and determines whether to deploy airbags and seatbelt pretensioners, ensuring the safety of vehicle occupants in the event of a collision.

As the brain of the passive safety system, this control unit is responsible for activating relevant restraint devices—such as the driver’s airbag, knee airbags, or seatbelt pretensioners—within milliseconds upon impact. It continuously monitors all connected sensors and components for proper functionality.

Therefore, flawless operation is critical for safety. The unit also communicates with other control modules in the vehicle and, in case of a fault, stores corresponding entries in the fault memory, which are indicated by the airbag warning light.

Why does the control unit 99680308902 P20 fail?

The most common causes of failure for the control unit 99680308902 P20 include internally stored crash data after an accident, which locks the unit, as well as internal hardware defects in electronic components. External factors such as undervoltage caused by a faulty battery or alternator can also lead to malfunctions.

A very common reason for repair is the storage of crash data. Even after a minor accident—for example, rear-end damage where the seatbelt pretensioners were activated—the control unit remains permanently locked. It must then be electronically reset to restore full functionality of the airbag system.

Independently of accidents, internal electronic components may also fail. Defects in individual parts, short circuits, or moisture damage are typical causes of complete failure or sporadic errors. Voltage fluctuations in the vehicle’s electrical system, often due to an aging battery, can likewise result in internal faults.

In workshop diagnostics, error codes such as “Internal Error” or issues with the “fuel shut-off valve” frequently appear, directly indicating a defect within the control unit itself. It is important to note that other part numbers like 996.618.219.01 or 5WK4062 are also associated with this device; however, the primary designation for the Boxster 986 is 99680308902 P20.

How do you recognize a defect in the 99680308902 P20?

A defect in the control unit 99680308902 P20 almost always manifests as a constantly illuminated airbag warning light on the instrument cluster. Often, the control unit cannot be read using a diagnostic tool because communication is impossible, or specific error codes point to an internal fault.

The primary and unmistakable symptom is the active airbag warning light. It does not turn off after starting the vehicle, indicating that the entire restraint system is disabled and offers no protective function in the event of a crash.

Another clear sign is when the service workshop’s diagnostic equipment cannot access the airbag control unit. The fault memory then displays “No communication with airbag control unit,” suggesting a serious internal malfunction.

If error codes such as “Internal Error,” “Control Unit Defective,” or specific faults related to seatbelt pretensioners or the fuel shut-off valve can be retrieved, this further confirms a defect within the unit itself. These errors generally cannot be cleared.

In which vehicles is the control unit 99680308902 P20 installed?

The airbag control unit with part number 99680308902 P20 is specifically designed for the first-generation Porsche Boxster. Airbag24 specializes in repairing this control unit for the aforementioned vehicle model, offering an affordable and reliable alternative to a new part.

At Airbag24, we repair this control unit for the following model:

Porsche Boxster 986 (model years 1996–2004)

What are the advantages of repairing the 99680308902 P20?

Repairing the original control unit provides significant cost savings compared to purchasing an expensive new part, which often costs between 800 and 1,000 euros. Additionally, there is no need for time-consuming re-coding, as all vehicle-specific data remains intact, saving both time and further workshop expenses.

The biggest advantage is the substantial cost reduction. Rather than buying a new unit—whose price, according to research, can quickly reach four figures (e.g., variant 99680308902J40)—repair represents a financially sensible solution.

Another crucial benefit is preserving the vehicle’s original coding. Since the original unit is repaired, it does not require re-learning or reprogramming after installation. It functions immediately according to the “plug-and-play” principle, significantly reducing the time spent at the workshop.

Moreover, repair is a sustainable alternative, as it helps avoid electronic waste and conserves valuable resources. Airbag24 provides a 12-month warranty on all repairs performed.

How does the repair process work at Airbag24?

The repair process at Airbag24 is simple and transparent. After removing the defective control unit, it is securely packaged and shipped to us. Our technicians perform a precise diagnosis, fix the fault at the component level, and return the tested unit to you.

It is recommended to have a professional diagnosis carried out at a specialized workshop before removing the control unit, in order to rule out other potential causes of failure, such as cable breaks. A diagnostic report should be included with the shipment.

Upon receipt at Airbag24, the control unit 99680308902 P20 undergoes a thorough analysis. Our technicians identify the fault using state-of-the-art diagnostic equipment. Depending on the nature of the damage, defective electronic components are replaced or stored crash data is professionally erased.

Finally, each repaired control unit undergoes a comprehensive functional test to ensure flawless operation. Of course, you receive a 12-month warranty on the completed repair.

What shipping options are available?

Airbag24 offers flexible and secure shipping options for your control unit. You can either send the package to us yourself free of charge or arrange a convenient UPS pickup. For returns, we provide free standard and fast express options, including cash-on-delivery.

For outbound shipments, you have the choice: send the package to us yourself or use the convenient UPS pickup service, which collects the package directly from your preferred location. Alternatively, you can also drop off the device in person at our facility.

The return shipment of the repaired control unit is provided free of charge by default via UPS standard shipping. If faster delivery is required, we also offer UPS express shipping.

Both standard and express shipping options are available with cash-on-delivery as well. Of course, you can also pick up your repaired control unit in person at our premises.