Engine Error
P0418
Secondary Air Injection System Control A Circuit
Severity
Low
Symptoms
Check engine light, failed emissions
Common Causes
- Failed secondary air injection pump relay
- Defective air injection pump
- Open circuit in pump wiring
- Blown main pump fuse
How to Fix
- 1 Test and replace pump relay
- 2 Replace secondary air pump
- 3 Repair wiring harness
- 4 Replace maxi-fuse
Estimated Repair Cost
USD
$20
–
$400
Relay/Fuse: $20 - $50; Air pump: $150 - $400