Technical Definition:
Secondary Air Injection System Insufficient Flow (Bank 1)
Trouble Code: P0491
Address: 0x0491
System: Powertrain
Subsystem: Auxiliary Emission Controls
Address: 0x0491
System: Powertrain
Subsystem: Auxiliary Emission Controls
Technical Description:
Possible Causes:
Possible Symptoms:
Secondary Air Injection System Insufficient Flow Bank 1
Possible Solutions:
OBD-II Trouble Code Type:
Diagnostic Step:
Tech Notes:
– Intake leak
– Damaged AIR system components
– Faulty AIR Solenoid Valve
– Faulty AIR system relay