Body, generic

B011D Fluid Reservoir Level Sensor B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B011D concerns level sensor B. Not every washer tank relies on a float. Volkswagen's bulletin 2037322 (2015) describes its washer level sensor G33 as a part whose reading depends on the fluid itself: the wrong mix or additives coat the sensor, cut its sensitivity and leave the lamp lit with a full tank; the remedy is draining, cleaning the sensor and refilling with approved fluid. Sensors moulded into the reservoir cannot be replaced on their own. A non-contact alternative is the capacitive single-point detector of patent US5017909A, fixed on the outside wall at the minimum level, where the liquid shifts the measured capacitance. Which principle sits behind letter B is not published, and no maker lists B011D publicly.

Likely causes

Deposits from unsuitable washer fluid or additives on the sensing surface
Sensor electronics or electrodes defective
Open or short in the sensor wiring

Symptoms

  • Warning lamp lit with a full reservoir, often after a change of washer fluid
  • Level warning appears late or not at all

Repair estimate

DifficultyMediumDIY possible
Parts and labour€10–200
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fluid reservoir level sensor bsensor wiring

Related codes

B011CB011EB011FB0120B0121

References: static.nhtsa.gov, patents.google.com.