Bank 2 System B Air-Fuel Ratio Imbalance
The secondary fuel system B on bank 2 (e.g. port-injection rail in a dual-injection engine, or LPG/CNG rail in a bi-fuel system) does not maintain calibrated mixture - lambda response on bank 2 is biased by an offset on the B system.
Affected components
- Fuel system b b2
Common causes
- High likelihood: Secondary fuel system has drifted
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
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.