Airbag control unit with part number A0009058202

What is the function of the airbag control unit A0009058202?

The airbag control unit A0009058202, manufactured by Bosch, is the central control unit of the occupant protection system in the Mercedes-Benz S-Class C217. It analyzes data from crash sensors and is responsible for precisely and reliably deploying the relevant airbags—such as the steering wheel, side, head, and passenger airbags—in the event of a collision.

As a key safety component, this control unit continuously monitors all connected components of the restraint system, ensuring that the system remains fully operational at all times and provides optimal protection to occupants in an emergency.

The control unit is known under the verified part numbers A0009058202, 000 905 82 02, and A2179008302 and is specifically tailored to the electronic architecture of the S-Class C217 Coupe.

Why does the control unit A0009058202 fail?

The primary cause of failure for the control unit A0009058202 is electronic defects in internal components. External factors such as moisture, severe vibrations, or simply the aging of electronics can lead to malfunctions in components like capacitors, resistors, or the microcontroller, resulting in system failure.

An accident can also directly damage the control unit or cause an internal lockup. During diagnostics, such issues often manifest as specific error codes indicating short circuits in sensors or processor faults.

The complexity of the assembly makes it susceptible to these failures, which typically require professional repair rather than costly replacement.

How do you recognize a defect in the A0009058202?

A defective airbag control unit A0009058202 is primarily indicated by the airbag warning light on the dashboard remaining constantly illuminated. Additionally, warning messages related to the airbag system may appear on the vehicle’s display, signaling a system fault that does not clear.

Another clear sign is when the control unit becomes unresponsive during a workshop diagnostic. Diagnostic tools—such as a Mercedes-specific tester like Xentry—may be unable to establish communication with the control unit or read out specific error codes that confirm an internal defect.

In some cases, the device may experience total failure, compromising the vehicle’s entire safety functionality.

In which models is A0009058202 installed?

The airbag control unit with part number A0009058202 is designed specifically for one vehicle series. At Airbag24, we repair this module, which was exclusively fitted in the Mercedes-Benz S-Class Coupé (C217) model years 2014–2020.

Repair is available for the following models:

Mercedes-Benz: S-Class Coupé (C217), 2014–2020

How is the A0009058202 control unit professionally repaired?

After being sent to Airbag24, the A0009058202 control unit undergoes a precise repair process. First, an initial inspection and diagnosis are performed to verify the root cause of the fault. The unit is then opened, cleaned of any corrosion, and defective electronic components—such as resistors, capacitors, or the microcontroller—are replaced using proper procedures. Finally, functionality is tested, and the device is returned with a 12-month warranty.

The removal of the control unit typically takes place beneath the center console or near the passenger seat. Following repair, proper coding with Mercedes-specific software like Xentry is essential to ensure full compatibility with the vehicle. This step is critical, as incorrect coding could disable the airbag system.

Is repairing A0009058202 worthwhile?

Repairing the airbag control unit A0009058202 is an economically and technically sensible alternative to purchasing a new unit. Cost savings are substantial, as new parts can range from €500 to €2,000, whereas repairs cost only a fraction of that amount.

Another advantage is the quick turnaround time. While new units often come with long lead times, repairs are completed promptly. Moreover, professional refurbishment backed by a 12-month warranty offers greater reliability than buying a used control unit, whose condition and history are frequently uncertain.

How does the control unit reach Airbag24?

To have your control unit repaired, you can bring it to Airbag24 free of charge or ship it yourself. Alternatively, the convenient UPS pickup service collects the package directly from your chosen location. For return shipping, several options are available.

Standard returns are shipped free of charge via UPS Standard. If faster delivery is needed, you can opt for UPS Express. Both shipping methods also offer cash-on-delivery. Of course, you can also pick up your repaired control unit in person.