What are the four wires of the oxygen sensor?

[Gale]

The four white wires of the oxygen sensor are: 1. The first two wires are heater wires, one positive and one negative; 2. The third and fourth wires are the mainboard's positive and negative signal wires, with one black wire being the signal wire and one gray wire being the signal ground wire. The heater wires refer to the heater coil power supply and ground wire, both connected to the engine's computer, enabling the car's oxygen sensor to enter the working state more quickly. As for the remaining two signal wires, they are connected to the vehicle's power supply and serve to control the air-fuel ratio of the car. The function of the oxygen sensor is to detect the oxygen concentration in the exhaust and send a feedback signal to the ECU, which then controls the increase or decrease of the fuel injector's fuel supply, keeping the air-fuel ratio of the mixture near the theoretical value.