Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance
The signal of the SAI air flow or pressure sensor is implausible during operation. The reading does not change as expected when the air pump is commanded.
Affected components
- Sai pressure sensor
- Secondary air pump
Common causes
- High likelihood: Clogged SAI passages
- Medium likelihood: SAI sensor drift
- Low likelihood: Sensor element aged beyond calibration window
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.