Secondary Air Injection System Switching Valve Stuck Open (Bank 1)
The secondary air injection system valve is stuck open on Bank 1.
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What it means (plain English)
Inside the engine, the secondary air injection system adds air to the exhaust to help reduce emissions during cold starts. If the valve that controls this airflow gets stuck open, it can cause engine performance problems and increased emissions.
What the computer is actually seeing
The engine computer monitors the operation of the secondary air injection system. If it detects that the valve is continuously open when it should be closed, it triggers this code.
What a healthy reading looks like
During operation, the valve should open for approximately 90 seconds during a cold start at temperatures below 50°F (10°C). Should see voltage of around 12V at the valve when activated.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check wiring and connectors at the secondary air injection valve for damage or corrosion. Replace if damaged.
- 22. Use a multimeter to test the voltage at the valve connector while the engine is cold. Expect near battery voltage (12V). If absent, trace back to the ECM for issues.
- 33. Inspect the secondary air injection valve for proper mechanical operation. Manually actuate the valve to check for sticking or blockage.
- 44. Perform a visual check of the secondary air injection system passages for obstructions. Clean or clear as necessary.
- 55. Clear the code and test drive the vehicle to see if the code returns.
Common causes
- Faulty secondary air injection switching valve
- Wiring or connector issues to the valve
- Failed engine computer (ECM)
- Blocked passages in the secondary air injection system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's safe to drive, but emissions may be higher, and performance could be affected.
Will the check engine light come back after repairs?
If the issue is fixed correctly, the light should stay off.
Why does this code sometimes pair with other emissions codes?
Secondary air injection issues can lead to increased emissions, triggering related codes.
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