Engine Error
P0411
Secondary Air Injection System Incorrect Flow Detected
Severity
Low
Symptoms
Check engine light, failed emissions test
Common Causes
- Failed air injection pump
- Clogged air injection ports
- Faulty check valve
- Vacuum leak at control solenoid
How to Fix
- 1 Replace secondary air pump
- 2 Clean carbon from injection ports
- 3 Replace air injection check valve
- 4 Fix vacuum leaks
Estimated Repair Cost
USD
$80
–
$500
Check valve: $80 - $150; Air pump: $200 - $500