What does it mean when the BMW engine yellow light comes on?

[VanCassandra]

There are many possible reasons for the engine light to come on, which can be roughly divided into three categories: a fault code is reported, but the engine is working normally. It may be that an operation at some point exceeded the computer's control range. The fault code fed back by the computer can be eliminated first, and then check whether the fault code still appears. Minor faults: The engine has no obvious faults. According to computer detection information and further inspection, certain faults are found that do not affect normal driving or have minimal impact. These need to be identified and resolved in a timely manner. For example, a faulty intake pressure sensor. Major faults: Such faults can be felt by the naked eye and driving experience, seriously affecting the normal operation of the engine and requiring immediate repair. For example, obvious lack of engine power may be due to an oxygen sensor issue. Solution: When the vehicle fault light comes on, it is mostly caused by the fuel emission system. When the fault light is on, start and turn off the vehicle three times, then observe whether the fault light remains on. If it does, it is necessary to promptly check the fault code at a repair shop to determine whether it is an engine problem or a sensor fault. If the light does not come back on, it may be a sporadic fault and does not require immediate inspection. When the computer receives parameters from the oxygen sensor indicating that the exhaust emissions severely exceed the national legal standards, the internal program of the computer cannot correct it to the standard range. At this time, the engine control computer will issue a pollution emission warning light (yellow pollution light) through the instrument panel to remind the owner to check the engine pollution emission light at a repair station. It is recommended to go to a professional 4S shop for testing, maintenance, and repair, where professional technology is combined with top-notch testing equipment.