Abnormal automobile exhaust controller

Does the subject want to ask "the reason why the automobile exhaust controller is abnormal" There is something wrong with the sensor, false fault.

1. There is something wrong with the sensor. Such as intake pressure sensor failure, oxygen sensor failure, etc.

2. False failure. Sometimes there will be a false fault in the car, that is, there is nothing wrong with the car itself, but a fault code will appear when an operation is beyond the control of the computer.