The engine warning light in Tang DM may illuminate due to the following 7 main reasons: Sensor malfunction: The sensors mentioned here include coolant temperature, crankshaft position, air flow, intake temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or signal interruption occurs, the vehicle's ECU cannot accurately obtain engine data, which may trigger the engine warning light. Fuel quality issues: If fuel or engine oil is not added according to the manufacturer's requirements, it may cause engine wear and trigger the warning light. Poor combustion of air-fuel mixture: Poor combustion can lead to engine carbon deposits or knocking. When detected by the oxygen sensor and reported to the ECU, the warning light will illuminate as a warning. Spark plug failure, ignition coil failure, fuel pump failure, or fuel line blockage can all cause poor combustion of the air-fuel mixture. Turbocharging issues: Intake turbocharging pipelines or turbochargers can also trigger the engine warning light. The most common issue is turbocharger damage, accompanied by symptoms such as oil leakage, high oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust pipe. Intake issues: If there is a problem with the car's intake, it may lead to engine pipeline blockage, and in severe cases, the engine warning light may illuminate. A dirty air filter that is not cleaned regularly can cause intake problems. Exhaust issues: Exhaust faults can also trigger the engine warning light. Rear oxygen sensor, catalytic converter, exhaust camshaft, or bearing failures are common causes of exhaust problems, with the catalytic converter being the most frequent issue. Using leaded gasoline, lead or silicon-based lubricant additives, physical damage to the catalytic converter, or fuel system failures can easily cause catalytic converter problems. Anti-theft system malfunction: If the car's electronic anti-theft system fails or if the anti-theft controller does not match the engine electronic controller, the anti-theft system may prevent the engine from operating normally and trigger the engine warning light. If the engine warning light is on, follow these steps: First, check if the engine is running normally. Look for issues such as shaking or black smoke. If present, avoid restarting the engine. Note: Do not restart the engine if the red warning light is on. If the engine can be started, turn it off for 5-10 minutes. Then, without pressing the brake, press the start button once or turn the key halfway to the 'ON' position without depressing the clutch. The car will enter self-check mode after powering on. Wait 5-10 seconds to see if the warning light turns off. If the warning light remains on, visit a service center as soon as possible. The service center can use a portable diagnostic tool to read the fault code, identify the issue, and perform targeted repairs.
