The Honda B1 service code is an alert from your Honda Maintenance Minder system. This system uses various service codes to inform Honda owners when it’s time for required maintenance.
The B1 service code means:
This service code appears on most Honda Motor Company car models and is an important signal for any Honda vehicle.
Note: The Honda Maintenance Minder also acts as an oil life indicator, and informs you about your engine oil life. Additionally, the system monitors engine operating conditions, speed, and vehicle usage.