What are the reasons for the engine warning light in Mercedes GLE?

[StellaLynn]

Sensor malfunctions, car maintenance issues, fuel quality problems, poor combustion of the air-fuel mixture, engine intake issues, turbocharging problems, exhaust system faults, and anti-theft system malfunctions are the main reasons for the engine warning light to illuminate. Additionally, during vehicle startup, the car performs a self-check on the engine system. Normally, the engine warning light should turn off after the self-check is completed. If it remains on for an extended period, it is advisable to visit a service center promptly for professional assistance to diagnose and eliminate potential safety hazards. Detailed explanations for each type of fault: Sensor issues: Sensors include coolant temperature, crankshaft position, air flow, intake temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or experience signal interruptions, the car's ECU cannot accurately obtain engine data, which triggers the engine warning light. In such cases, it is essential to visit a repair center for professional diagnosis and timely resolution of safety risks. Maintenance issues: Poor engine maintenance is the most common cause of the engine warning light illuminating. Vehicles have specific maintenance schedules. If maintenance is not performed on time, combined with poor driving habits, the engine's operational burden increases, eventually causing the engine warning light to alert the owner of a fault. Fuel quality issues: This refers to both fuel and engine oil. The fuel used in cars typically has a specific octane rating, and engine oil can be semi-synthetic or fully synthetic. Manufacturers usually recommend the type of fuel and engine oil to use. If the owner fails to follow these recommendations, prolonged use can lead to engine wear, triggering the warning light. Always use the recommended fuel grade and appropriate engine oil. Poor combustion of the air-fuel mixture: Faulty spark plugs, ignition coils, fuel pumps, or clogged fuel lines can cause poor combustion of the air-fuel mixture. This leads to engine carbon buildup or knocking, which the oxygen sensors detect and report to the ECU, resulting in the warning light illuminating as a warning. Intake issues: The engine requires air for combustion, and the air filter plays a critical role. If the air filter is dirty or not cleaned regularly, it can affect the engine's air intake, potentially leading to blockages. Severe cases can cause the engine warning light to illuminate. Turbocharging issues: Problems with the intake boost pipes or turbocharger can also trigger the engine warning light. The most common issue is turbocharger failure, accompanied by symptoms such as oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Exhaust issues: Faults in the rear oxygen sensor, catalytic converter, exhaust camshaft, or bearings can cause the engine warning light to illuminate. The most common issue is catalytic converter failure, often caused by using leaded gasoline, lead or silicon-based oil additives, physical damage to the converter, or fuel system malfunctions. Anti-theft system: If the car's electronic anti-theft system malfunctions or the anti-theft controller is incompatible with the engine ECU, the engine may fail to operate correctly, and the warning light will illuminate. Solutions for the engine warning light: If the engine warning light is on and the car cannot start, this may be due to a faulty fuel pump or ignition components. It is recommended to call for assistance immediately. If the engine warning light is on and the car is drivable but experiences severe shaking or loss of power, pull over safely and call for roadside assistance. If the engine warning light is on but the car drives normally, it may be due to a faulty sensor. In this case, you can continue driving cautiously at low to moderate speeds but should visit a repair shop as soon as possible to address the issue.