What Causes the BMW Ignition Warning Light to Illuminate?

[Oscar]

BMW ignition warning light may illuminate due to the following reasons: Sensor Issues: Sensors include coolant temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor connections, or experience signal interruptions, the vehicle's ECU cannot accurately obtain engine data, which may trigger the engine fault light. Maintenance Problems: Poor engine maintenance is the most common cause of the engine fault light illuminating. Vehicles have specific maintenance schedules, and if owners fail to adhere to these schedules combined with poor driving habits, it can increase the operational burden on the engine. Fuel and Oil Quality Issues: This includes both fuel and engine oil. The fuel used in cars has specific octane ratings, and engine oils are categorized as semi-synthetic or fully synthetic. Manufacturers recommend specific fuel grades and oil types for use. If owners do not follow these recommendations, prolonged use of incorrect specifications can lead to engine wear.