What is a Porsche 911 Targa 4S 991 airbag control unit?
The Porsche 911 Targa 4S 991 airbag control unit is your vehicle's central safety unit, responsible for occupant safety. It continuously monitors vehicle information and precisely deploys the airbags and seatbelt pretensioners in the event of an impact. This safety-relevant module also stores important crash data and ensures the correct functioning of all restraint systems.
This electronic module has been specially developed for the Porsche 911 model 991, especially the Targa 4S variants from 2014 to 2020.
It is the brain of the passive safety system and processes signals from various sensors to decide whether to activate it in milliseconds.
Why is the Porsche 911 Targa 4S 991 airbag control unit defective?
A Porsche 911 Targa 4S 991 airbag control unit often fails because crash data is permanently stored after an accident, preventing the error message from being cleared. Internal memory errors, software malfunctions, or power supply problems can also lead to failure, which activates the airbag warning light.
After an accident, the control unit is usually locked because the crash data cannot be easily reset.
This requires a professional component-level repair to restore full system functionality.
Even without an accident, internal defects such as EEPROM read/write errors or software malfunctions can impair operational readiness and make a Porsche 911 Targa 4S 991 airbag control unit repair necessary.
Common error codes for Porsche 911 Targa 4S 991 airbag control unit repair
When diagnosing a faulty Porsche 911 Targa 4S 991 airbag control unit, specific error codes will appear that indicate internal problems, not related to sensors or airbags. These include communication errors, memory defects, or power supply issues for the control unit itself.
- B1000 → Control unit communication error → Error in the data transmission between ECU and vehicle.
- B2000 → Internal memory error in the control unit → Defect in the internal data memory of the airbag module.
- B2001 → Control unit power supply error → Insufficient or interrupted power supply to the airbag ECU.
- B2002 → Control unit software malfunction → Faulty or corrupt software in the airbag control unit.
- B1001 → Power supply/diagnostic line error → Problems with the electrical supply or the diagnostic line.
- B1002 → UDS protocol communication error → Malfunction in the standardized diagnostic interface.
- B2003 → EEPROM Read/Write Error → Error reading or writing permanent data in memory.
- B2004 → Malfunction in the internal diagnostic system → The control unit cannot check its own functions correctly.
- F20004 (FA20004) → Control unit-specific error code → Manufacturer-specific, scanner-dependent ECU error.
- Crash data saved → Control unit locked after accident → Accident event was permanently registered in the control unit.
What part numbers are available for the Porsche 911 Targa 4S 991 airbag control unit repair?
For the Porsche 911 Targa 4S 991 airbag control unit repair, only specific, 100% verified original OEM part numbers are relevant. These ensure a precise fit and full safety functionality for your vehicle, as they come directly from Porsche and are confirmed for the 991 Targa 4S model.
The following original Porsche OEM part numbers are verified for the airbag control unit of the Porsche 911 Targa 4S (model 991, approx. 2014-2019):
- 99161820108
- 99161820103
- 99161820102
- 99161820104
- 99161820111 (also valid as replacement for 99161820109/10)
These numbers represent different revisions or variants of the same airbag control unit, all of which are fully compatible with the Porsche 991 model mentioned.
Supplier-specific OEM numbers from manufacturers such as Bosch or Continental are not listed as direct replacement part numbers for this specific airbag control unit.
When repairing a Porsche 911 Targa 4S 991 airbag control unit, please ensure that these numbers match to ensure safety and system integration.