B0226Headlamp Auto-Leveling Front Sensor
- Generic OBD-II code · Body
- How the car detects it
- The publicly available J2012 lists have no B0226, and no maker documents it for headlamp levelling. Saab uses the number in its 9-3 climate control: B0226 01 is a short to B+ in the recirculation motor circuit, possibly causing stale air or misted windows. Automatic levelling, as HELLA explains, keeps the beam cut-off steady as the load changes. A control unit compares front and rear axle sensors with stored values and drives small motors in the headlamps; dynamic systems, found on almost all xenon cars, also correct for braking and acceleration. Compact cars often omit the front sensor. Each axle sensor is an angle sensor whose lever is clipped to a suspension arm; older ones use a potentiometer, newer ones inductive measurement. With the front sensor failed, the beam stays where it was.
- What you may notice
- Headlamp levelling warning shown and beam height no longer adjusts
- Oncoming drivers flash because the beam is set too high under load
- Likely causes
- LikelyLever or coupling rod of the front axle sensor bent, broken or detached
- PossibleConnector or wire at the sensor corroded or damaged by road splash
- PossibleSensor worn out internally or not calibrated after replacement or suspension work
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.