Engine Error
P0412
Secondary Air Injection System Switching Valve A Circuit
Severity
Low
Symptoms
Check engine light, failed cold-start emissions test
Common Causes
- Failed secondary air injection switching valve
- Open or shorted wiring to the valve
- Blown fuse for the AIR system
- Corrosion in the valve connector
How to Fix
- 1 Test and replace air injection switching valve
- 2 Repair wiring harness
- 3 Check and replace related fuses
- 4 Clean connector contacts
Estimated Repair Cost
USD
$50
–
$250
Switching valve: $80 - $250