OBD-II Generic Error Code P0416: How to Fix It

Q: What does error code P0416 mean?

P0416 means the secondary air injection (SAI) system valve B is stuck open. This valve controls airflow from the air pump to the exhaust; when stuck open, it disrupts air-fuel mixture and triggers the check engine light.

Q: Can I drive with a P0416 code?

Yes, but it may cause rough idle, reduced fuel economy, and increased emissions. Long-term driving could damage other components. It's best to fix it soon.

Q: Is P0416 a serious error?

It's considered medium severity. While not immediately dangerous, it can affect engine performance and emissions. Ignoring it may lead to failed emissions tests.

Q: How much does it cost to fix P0416?

Costs vary widely: DIY cleaning/fuse replacement can be under $20. Replacing the SAI valve or pump (including labor) can range from $150 to $500 depending on the vehicle.

Q: Will a vacuum leak cause P0416?

Yes, a vacuum leak in the hoses controlling the SAI valve can cause it to remain open, triggering P0416. Inspect and replace cracked hoses.

Abstract

Error code P0416 indicates that the secondary air injection (SAI) system valve 'B' is stuck open, allowing air to flow when it shouldn't. This can cause rough idle, poor performance, and a check engine light. The SAI system pumps fresh air into the exhaust to reduce emissions during cold starts.