Powertrain
generic / SAE
P23FE
Bank 1 System B Air-Fuel Ratio Imbalance
The secondary fuel system B on bank 1 (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 1 is biased by an offset on the B system.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / FE
Possible causes
- Secondary fuel system has drifted high
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 1–4 h
- Component: fuel system b b1
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012