 I mean, the computer right now just reads the sensor. The sensor is telling it what the feedback it's getting. But even when the sensor malfunctions, either you have a malfunction or the sensor is malfunctioning. One of the two. And you have to find said sensor and replace it in order to find out why it's not working. You need to know you by looking can figure out or can the computer tell you which cylinder is malfunctioning.