B009ALeft Side Restraints Sensor 4
- Generic OBD-II code · Body
- How the car detects it
- B009A extends the left-side sensor row past the three positions most cars use. No carmaker documents this code publicly. Mitsubishi's airbag index ends the left row at B0093 (C-pillar), and FCA numbers its pillar satellites in its own B276x range, so neither fills the fourth slot. A fourth left sensor makes sense on long bodies or extra seat rows: Bosch says its acceleration satellites can sit on sills, seat cross members, B- and C-pillars and also in the rear, while pressure sensors watch a door cavity. If a vehicle sets B009A, the airbag module has lost a plausible signal from that added satellite or found it shorted, open or wrongly configured; the matching subtype and location must be taken from the maker's own airbag documentation. The airbag lamp comes on.
- What you may notice
- Airbag warning lamp on
- Left side impact detection in the area of the missing sensor is weaker
- Safety note: airbag system; disconnect the battery and keep the wait time before any work on sensors or wiring, specialist workshop only
- Likely causes
- LikelyDamaged line or plug to the fourth left sensor, often after seat or trim removal
- PossibleInternal fault of the fourth left crash satellite
- RareAirbag module coded for a sensor layout the vehicle does not have
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.