B0091Left Side Restraints Sensor 1
- Generic OBD-II code · Body
- How the car detects it
- B0091 covers the first left-side crash sensor, which Mitsubishi places in the front door and lists as DOOR SATEL SENS LH with the J2012 title in brackets. The airbag unit checks it with the ignition on and stores a subtype after a two-second delay: -11 for a short to ground, -55 when the configuration held in the unit does not fit the vehicle, -81 for a communication fault, plus further bytes. Door satellites of this kind are usually pressure sensors: Bosch explains that the sealed door cavity acts as the sensing volume, so a crush raises pressure and the module can decide within about 5 ms. Continental sells a pressure satellite for the same task. With B0091 set, the airbag lamp lights and left side impact sensing may be weakened.
- What you may notice
- Airbag warning lamp on
- Side and curtain airbags on the left may deploy late or not in a side impact
- Safety note: airbag system; disconnect the battery and keep the wait time before door work, then have it checked at a specialist workshop
- Likely causes
- LikelyShort or poor contact in the door harness or connector to the sensor
- PossibleInternal fault of the front door satellite sensor
- PossibleAirbag unit configuration not matching the vehicle (Mitsubishi subtype -55)
- RareInternal fault of the airbag diagnosis unit
- 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.