B3A3F

Active Aerodynamic Feature B Actuator Position Sensor Not Learned

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$111–333 (est.)

Symptoms

Error message on the dashboard
Unstable operation of active aerodynamics
The car does not adjust the body kit to the driving speed

Causes

Actuator position sensor circuit open
Mechanical jamming of the actuator
Oxidation of contacts
Calibration fails after battery drain
The need to retrain the actuator after repair

How to Fix

Checking the free movement of the actuator mechanically
Position Sensor Circuit Diagnostics
Cleaning the contacts and conductive paths of the sensor
Carrying out the training procedure using a dealer scanner
Reconfiguring the active aerodynamics control unit if necessary

Related codes

B3A3E B3A40 U0121