Powertrain
generic / SAE
P0412
Secondary Air Injection System Switching Valve A Circuit
A general electrical fault on AIR system switching valve A — open, shorted, or out of plausibility. The valve diverts secondary air between manifolds during cold start to speed up catalyst light-off.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 12
Possible causes
- Solenoid winding open or shorted high
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–500 €
- Estimated time: 0.5–2.5 h
- Component: secondary air injection valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012