Part of the generic B1801 overview — this page covers the Lexus meaning specifically.
OBD-II Diagnostic Trouble Code
B1801
Driver-Side Airbag Squib Circuit Open
B
Body
comfort / safety
comfort / safety
1
Mfr
manufacturer code
manufacturer code
8
Body subsystem
01
Driver-Side Airbag Squib Circuit Open
Severity · general guide
Varies
Body/safety — depends on system
Code type
Lexus
System
Body
Model
ES
Years
2021