P0412
Secondary Air Injection System Switching Valve A Circuit Malfunction
Generic code
Auxiliary Emissions Control
Medium severity
Moderate repair
Free on OBD DashX
Want real-world data on P0412?
See which problems come with P0412, how often it shows up in other vehicles, and how to fix it — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
What P0412 means
- The fault code P0412 indicates that there is a problem with the circuit that controls the secondary air injection system switching valve A. This may cause the vehicle to fail emissions testing or cause the engine to run poorly.
Possible symptoms
- Illuminated check engine light
- Failed emissions testing
- Rough idle or stalling
Possible causes
- Failed secondary air injection system switching valve A
- Faulty wiring or connections in the circuit
- Loose or corroded electrical connections
Related parts
- Exhaust Pipe Air Injection: Air is injected into the exhaust gases for better combustion of unburnt fuel and pollutants. This allows better exhaust emission. Problems lead to harmful emissions out of limit
Possible solutions
- Replace the secondary air injection system switching valve A
- Check and repair any damaged wiring or connections
- Tighten or clean any loose or corroded electrical connections
Free on OBD DashX
P0412 on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
Open P0412 No sign-up needed · available in 10 languagesScan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.