P0491 - Secondary Air Injection System Insufficient Flow Bank 1
Repair Importance Level:
Repair Difficulty Level:
- Intake leak
- Damaged AIR system components
- Faulty AIR Solenoid Valve
- Faulty AIR system relay
- Engine Light ON (or Service Engine Soon Warning Light)
The secondary air system detected that there was insufficient mass flow change during pump switching (on/off)
P0491 Information for specific makes
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