Code P046, Front-To-Rear Bank Fueling Imbalance: Notes

PCM controls rear bank fueling based upon rear oxygen sensor and front bank fueling based upon front oxygen sensor. Likely causes for imbalance include lean or faulty injectors on one side of engine, cracked or fouled spark plugs, or exhaust or intake manifold leaks. Code sets when front bank fueling differs greatly (richer or leaner) from rear bank fueling for 10 minutes.