O2 CTRL & ACT(BANK 1)(%) O2 CTRL & ACT(BANK 2)(%) _________________________________ (range not available) Indicates the overall operation and Long-term correction of fuel delivery for cylinders 1 to 3 (Bank 1) or 4 to 6 (Bank 2). They show whether the ECM is commanding an overall rich or lean mixture. Fuel correction operates only in closed loop. In open loop, a fixed value displays. A number above 0% indicates that the ECM has commanded a temporary rich mixture correction. A number below 0% indicates that the ECM has commanded a temporary lean mixture correction. These Short-term correction numbers are also used by the ECM to learn a fuel correction pattern or trend and are stored in the learned mixture or lambda values.