The B0004 fault code, applicable to all car manufacturers, means “Driver Knee Bolster Deployment Control (Subfault)”.
The B0003 fault code, applicable to all car manufacturers, means “Driver Frontal Stage 3 Deployment Control (Subfault)”.
The B0002 fault code, applicable to all car manufacturers, means “Driver Frontal Stage 2 Deployment Control (Subfault)”.
The B0001 fault code, applicable to all car manufacturers, means “Driver Frontal Stage 1 Deployment Control (Subfault)”.
The P0021 fault code, applicable to all car manufacturers, means “A Camshaft Position – Timing Over-Advanced or System Performance (Bank 2)”.
The P0020 fault code, applicable to all car manufacturers, means “A Camshaft Position Actuator Circuit/Open (Bank 2)”.
The P001F fault code, applicable to all car manufacturers, means “A Camshaft Profile Control Circuit High (Bank 2)”.
The P001E fault code, applicable to all car manufacturers, means “A Camshaft Profile Control Circuit Low (Bank 2)”.