B009A: Left Side Restraints Sensor 4
Standardized SAE J2012 code · B00xx — Restraints and airbags
Safety-critical system. Faults in airbags, brakes, steering or high-voltage components can put people at risk. Follow the manufacturer's service information and safety procedures, or have the vehicle checked by a qualified workshop.
What does B009A mean?
Fault on left-side restraints sensor 4. Side impact sensors detect lateral acceleration to trigger side and curtain airbags.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Common causes
- High Side impact sensor failed
Likelihood is a general estimate across vehicles; your make and model may differ.
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