B0120Fluid Reservoir Level Sensor E
- Generic OBD-II code · Body
- How the car detects it
- B0120 relates to level sensor E. Ford's application US20190265715A1 describes a container for sensor cleaning whose level sensor measures conductance at a fixed height: air gives a resistance above roughly 1000 ohms, the slightly conductive fluid one below it. Because the fluid moves with the car, the computer filters the signal with acceleration and yaw rate, then estimates the remaining volume from pump activity, and it suspects a leak if the level falls while no washing is requested, in which case the vehicle may be routed to a service centre. Ford's patent US10569746B2 puts such a container on the roof beside the lidar. Letter E is not tied publicly to any tank, and no manufacturer documents B0120. Without the signal, remaining fluid can only be guessed.
- What you may notice
- Refill warning too early, too late or constantly on
- Cleaning of exterior sensors may be restricted
- Likely causes
- LikelyElectrodes fouled or fluid with unsuitable conductivity (e.g. plain distilled water)
- PossibleOpen or short in the sensor circuit
- RareLeaking reservoir or hose making the level drop unexpectedly
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.