OBD-II Diagnostic Trouble Code
P0491
Secondary Air Injection System Insufficient Flow Bank 1
P
Powertrain
engine / trans
engine / trans
0
Generic
SAE standard
SAE standard
4
Auxiliary emission controls
91
Secondary Air Injection System Insufficient Flow Bank 1
Severity · general guide
Moderate
Fix soon — usually won't strand you
Code type
Generic
System
Powertrain