Code clearing shall be carried out in strict accordance with the fault code clearing scheme specified for specific vehicle models. It should be noted that the negative grounding wire of the battery can not be removed casually to clear the fault code. Otherwise, serious problems are likely to occur. The specific consequences are as follows: 1. Some models' control computers have lost their "history": I believe everyone knows that many models' automobile computers have the function of automatic memory, and the engine operation data stored in RAM will be automatically cleared after the negative grounding wire of the battery is easily removed, resulting in poor performance of the automobile for a long time after maintenance or a cleared fault code after driving for a period of time. 2. It may lead to the loss of normal functions: for example, voice lock is one of the more common examples. In this case, it is necessary to repair the sound separately, which is equivalent to picking up sesame seeds and losing watermelon.