DTC Alfa-Romeo B1021-29 Short Explanation
Channel: Maxidot Alfa-Romeo
Date: 20/06/2020

The video focuses on the basic Alfa-Romeo specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error

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Make: 
Alfa Romeo 
Code: 
B1021-29 
Definition: 
Signal Of Rear Axle Sensor Invalid (Electrical Error) - Signal Signal Invalid 
Description: 
When the Adaptive Front Lighting System (AFLS) Module detects less than 0.2 volts or greater than 4.7 volts on the Headlamp Leveling Sensor Rear Signal circuit for greater than one second. 
Failure Type: 
Signal Invalid
This sub type is used for failures where the value of the signal is not plausible given the operating conditions.