Pcm Code P046 - Front-To-Rear Bank Fueling Imbalance: Notes
WARNING: This page is about a different car, the 1993 Cadillac Seville and 1993 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
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.