Why does the engine fault code keep reappearing after being cleared?

[OliviaRose]

Here are the reasons why the engine fault code keeps reappearing after being cleared: 1. False fault: A fault code is reported, but the engine works normally. This may be caused by an operation that exceeded the computer's control range, and the computer fed back a fault code. You can clear it first and then check if the fault code reappears. 2. Minor fault: The engine does not show any obvious faults, but further inspection based on computer detection information reveals a real fault that does not affect normal driving or has minimal impact. It should be identified and resolved promptly. For example, a faulty intake pressure sensor. 3. Major fault: Such faults can be felt through visual inspection and driving experience, and they severely affect the normal operation of the engine. Immediate repair is required. For example, obvious lack of engine power, which is likely due to an oxygen sensor issue.