Scania fault code 621

Code 621 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:

CUV Visibility system Internal control unit, left-hand headlamp Fault in the internal control unit in the left-hand headlamp. Read explanation → BCI Automatic fire alarm, engine compartment The automatic fire alarm in the engine compartment has been activated via a discrete BCI2 signal. Read explanation →