How to measure the oxygen sensor, the measuring method of the four-wire oxygen sensor line

The four wires of the oxygen sensor we are talking about today actually refer to the four wires (two heating wires and two signal wires) connected to other devices on the sensor. But when asked how to measure the four-wire oxygen sensor, many friends are speechless, saying that they don't know much. So in order to solve this doubt, let's tell you the measurement method of the four-wire oxygen sensor line.

In fact, the method of detecting the oxygen sensor is relatively simple. First, use the two test leads of the multimeter to connect to the two signal wires of the oxygen sensor (the red pen is connected to the positive signal and the black pen is connected to the negative signal). Then directly observe the voltage change of the multimeter, the normal signal voltage range is 0.1~0.9V. Secondly, the faster the voltage frequency of the oxygen sensor changes, the better the sensor is. If the voltage is 0v or 1v, or even if it does not change, it means that the oxygen sensor at this time has been seriously aging, and it needs to be replaced with a new one in time.

Don't underestimate the problem of oxygen sensor failure. Once a failure occurs, the computer of the electronic fuel injection system cannot obtain accurate information about the oxygen concentration in the exhaust pipe, and thus cannot perform feedback control on the air-fuel ratio. As a result, the fuel consumption of the engine will increase, and the exhaust emissions will also increase. Over time, it is prone to malfunctions such as unstable engine idling, misfire, and surge. Therefore, when the oxygen sensor fails, it must be replaced in time.