Q: I received a Honda Earth Dream for repair. When checking the 4-wire oxygen sensor data stream, I found that the data stream did not display voltage, but current. What’s going on?
A: This means that the 4-wire oxygen sensor on this car is a wide-range air-fuel ratio sensor. The names on the data stream are air-fuel ratio and air-fuel ratio sensor. The value of the first air-fuel ratio is 14.7. If it is lower than 14.7, it is rich, and if it is higher than 14.7, it is lean; the value of the second air-fuel ratio sensor is 0. If it is greater than 0, it is rich, and if it is less than 0, it is lean. This data stream is easier to view.