P0416 Code: Secondary Air Injection (AIR) Switching Valve B Circuit Open
🟠 Moderate severity · drivable
Drivable — this affects cold-start emissions, not drivability.
What P0416 means
The circuit for the secondary air injection switching valve B is open, meaning power can't reach the valve. Without it, the air pump can't push fresh air into the exhaust during cold start.
Symptoms
- Check engine light is on
- Possible failed emissions test
- Possible air leak noise
- No driving symptoms
Common causes
- most common: Broken wire in the valve circuit
- common: Faulty switching valve solenoid
- less common: Corroded or loose connector
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check the valve connector and wiring for breaks | Yes | $0–50 |
| Replace the switching valve | Yes | $50–150 |
| Repair the open circuit wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a P0416 code?
Yes. It affects cold-start emissions, not drivability, but fix it before an emissions test.
What is the most common cause of P0416?
A broken wire in the valve circuit or a faulty switching valve solenoid.
How much does it cost to fix a P0416?
Typically $50–$150 for a new switching valve; a wiring repair is usually similar.
Related codes
P0415
P0415 Code: Secondary Air Injection (AIR) Switching Valve B Circuit Malfunction
P0417P0417 Code: Secondary Air Injection (AIR) Switching Valve B Circuit Shorted
P0410P0410 Code: Secondary Air Injection System Malfunction
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.