What does Fuel Trim Bank 1 mean?

[DeTucker]

It means increasing or decreasing the fuel injection quantity for the first group of cylinders, where a positive value indicates an increase in fuel injection and a negative value indicates a decrease. The system automatically adjusts this based on operating conditions, driver input, and engine adaptation. Here is an introduction to related content: Fuel Trim: Short-term fuel trim is the real-time correction control of fuel injection quantity based on the oxygen sensor's feedback regarding the mixture's richness or leanness in previous working cycles. The change in the long-term fuel trim coefficient, on the other hand, is a qualitative change formed by the electronic control unit based on the quantitative feedback results of the short-term fuel trim's continuous correct adjustments. This is the difference between them.