Fault code 3: Elimination:

Visually inspect the sensor linkage and check the plastic holder of the sensor.
Switch off ignition.
Pull plug off the angle sensor for HBA, front .
Switch ignition on
Measure voltage between terminal 5 of the sensor plug and ground.
Voltmeter display approx. 5 V
Measure voltage between terminal 5 and terminal 1 of the sensor plug.
Voltmeter display approx. 5 V
In the PST2 menu item Actual values, select Sensor voltage, spring travel 1 (front) .
Connect a jumper to terminals 4 and 5 of the sensor plug
PST2 display approx. 5 V
If no fault is detected in the wires, replace the angle sensor for HBA.