Why does the MG 5 display an engine emission fault?

[Gatsby]

Possible reasons include: 1. Damaged sensors: Sensors such as water temperature, crankshaft position, air flow, intake temperature, and oxygen sensors may be damaged, have poor contact, or experience signal interruption. When the car's ECU cannot accurately obtain engine data, it will trigger the engine fault light. 2. Poor engine maintenance: Poor engine maintenance is the most common cause of the engine fault light turning on. Vehicles have specific maintenance cycles, and if the owner fails to perform maintenance on schedule, combined with poor driving habits, it will increase the operational burden on the engine. 3. Fuel quality issues: Fuel quality includes both gasoline and engine oil. The fuel used in cars usually has a specific grade, and manufacturers typically recommend which grade of fuel and type of oil to use. If the owner does not follow these recommendations, it may lead to warnings over time.