P1411
Secondary Air Injection Downstream Flow
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Check Engine Light Is On
- Deterioration of vehicle dynamics
- Increased fuel consumption
- Unstable engine operation at idle
- Increase in harmful emissions
Causes
- Secondary air valve malfunction
- Dirty or clogged air passages
- Problems with vacuum hoses
- Secondary air pump malfunction
- Open or short circuit in control circuit
How to Fix
- Check the condition of the vacuum hoses
- Clean or replace secondary air valve
- Check the operation of the secondary air pump
- Diagnose the valve control circuit
- Clean the air channels of the system