What is a Ford Focus ST Mk4 airbag control unit?
The Ford Focus ST Mk4 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It continuously monitors sensors, collects important crash data, and ensures the precise deployment and proper function of all connected airbag modules and seatbelt pretensioners in the vehicle.
This safety-relevant control unit is based on modern vehicle electronics with a CAN bus connection. It is responsible for controlling components such as driver, passenger, side, and head airbags.
The unit records precise crash data in real time and deploys the airbags based on the type and severity of the accident. It communicates with other vehicle systems such as the engine control unit or ABS/ESP.
Due to its safety-critical role, the control unit has its own diagnostic interfaces and a storage function for error and crash codes. This enables detailed analysis after an event.
Why is the Ford Focus ST Mk4 airbag control unit faulty?
A Ford Focus ST Mk4 airbag control unit can malfunction due to internal electronic errors, power surges, or crash data stored after an accident. This often leads to an illuminated airbag warning light and the failure of the safety system, necessitating immediate Ford Focus ST Mk4 airbag control unit repair.
After an accident, important crash data is permanently stored in the control unit. This data prevents the airbag system from functioning again until a professional reset or repair is performed.
Internal hardware defects or software errors can often also lead to failure. These malfunctions are then stored as specific error codes in the error log and must be diagnosed.
The control unit can detect malfunctions in connected sensors or airbag modules. Although these do not directly cause the control unit to malfunction, the ECU can generate an error message and deactivate the system.
Common error codes for Ford Focus ST Mk4 airbag control unit repair
When diagnosing a Ford Focus ST Mk4 airbag control unit, specific B-codes stored directly in the control unit may indicate a fault. These trouble codes facilitate targeted Ford Focus ST Mk4 airbag control unit repair by accurately identifying the nature of the problem and assisting with the diagnosis.
- B0001 → Driver side airbag circuit fault (high resistance or open) → Signal or circuit problem detected in the airbag control module.
- B0002 → Driver side airbag second stage error → Malfunction in the second deployment stage of the driver airbag reported by the control unit.
- B2294 → Restraint system airbag control unit error → Internal error or communication problem of the airbag ECU exists.
- B2295 → Restraint system curtain airbag control unit error → Specific error in the control unit related to the curtain airbag detected.
- B2296 → Restraint system side airbag control unit error → The airbag control unit reports a malfunction related to the side airbag.
What part numbers are available for the Ford Focus ST Mk4 airbag control unit repair?
For a successful Ford Focus ST Mk4 airbag control unit repair or replacement, accurate OEM part numbers are crucial to ensure compatibility with your vehicle. The relevant numbers will help identify the correct control unit for your Ford Focus ST Mk4 model and find a suitable replacement.
- 8M5T-14B321-BD (Ford OEM, Bosch 0285010030) → Fits Ford Focus Mk4, verified multiple times.
- 2M5T-14B056-DE (Ford OEM, Bosch 0285001425) → Often mentioned in professional repair videos for Focus Mk4 airbag control units.
- KX7T-14B321-BB (Ford OEM) → Specifically listed in spare parts databases for Ford Focus Mk4 (ST-Line, HB).
These OEM part numbers belong to the airbag control unit assembly and have been verified for vehicle model compatibility using multiple independent sources. Other numbers, such as those for older generations, are not suitable for the Mk4.
Using the correct part number is essential to ensure full functionality and safety of the airbag system after the Ford Focus ST Mk4 airbag control unit repair. Using the incorrect unit could lead to system failures.
Before any repair or replacement, it is always advisable to check the chassis number carefully. Consultation with a Ford dealer or specialist workshop can help identify the exact control unit.