O2 CTRL FACTOR(BANK 1) O2 CTRL FACTOR(BANK 2) __________________________________ (range not available) Indicates the operation and Short-term correction of fuel delivery for cylinders 1 to 3 (Bank 1) or 4 to 6 (Bank 2). It shows whether the ECM is commanding a rich or lean mixture. The number theoretically can range from 0.0 to 1.9 with 1.0 as the midpoint. A number above 1.0 indicates that the ECM has commanded a temporary rich mixture correction. A number below 1.0 indicates that the ECM has commanded a temporary lean mixture correction.