Buick Excelle bank 1 Sensor 2 short-term fuel repair is 99.2% but the fault light is not on.

According to the information you provided, the short-term fuel correction value of Bank 1 Sensor 2 of Buick Excelle vehicle is 99.2%, but the fault light is not on. This may be due to one of the following reasons:

1. Not reaching the critical value: Under some fault conditions, the fault indicator usually lights up. Depending on different vehicle models and fault code settings, the short-term fuel correction value may not trigger the lighting of the fault lamp. Only when a specific fault condition exceeds a certain critical value will the fault indicator be triggered.

2. Temporary problems: The abnormal short-term fuel correction value may be caused by temporary problems, such as poor fuel quality and temporary failure of oxygen sensor. If the problem is temporary, the system will try to correct itself and fix the problem in the subsequent inspection, resulting in the failure indicator not being lit.

Although the fault indicator light is off, it is recommended that you further inspect the vehicle to ensure that the engine works normally. If you are worried about the performance of the vehicle or the existence of other failure indicators, it is recommended to contact a professional automobile technician as soon as possible or send the vehicle to an authorized automobile maintenance center for comprehensive diagnosis and maintenance.

Please be careful when the engine is running and observe the relevant safety regulations to ensure the safety of you and others.