AIR System B Incorrect Flow Detected
The second AIR system delivers measurably more or less air than expected. Often a partially blocked pipe, a worn pump, or a leak between pump and check valve.
Affected components
- Air pump b
- Air check valve
- Air flow sensor
Common causes
- High likelihood: Air pipe partially blocked by carbon
- Medium likelihood: Worn pump impeller reduces flow
- Medium likelihood: Leak between pump and check valve
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.