There are primarily 7 reasons why the Bora's engine warning light may illuminate: Sensor Malfunction: The sensors involved include those for coolant temperature, crankshaft position, air flow, intake temperature, and oxygen sensors. When these sensors are damaged, have poor contact, or their signals are interrupted, the vehicle's ECU cannot accurately obtain engine data, triggering the engine warning light. Fuel or Oil Quality Issues: Failure to use the fuel or engine oil as specified by the manufacturer may cause engine wear, leading to the illumination of the warning light. Poor Combustion of Air-Fuel Mixture: Poor combustion can result in engine carbon deposits or knocking. Once detected by the oxygen sensor and reported to the ECU, the warning light will illuminate as an alert. Issues like faulty spark plugs, ignition coils, fuel pump, or clogged fuel lines can all lead to poor combustion of the air-fuel mixture. Turbocharger Problems: The intake boost pipeline or turbocharger can also cause the engine warning light to come on. The most common issue is turbocharger damage, accompanied by symptoms such as oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Intake Issues: Problems with the car's intake system may lead to clogged engine pipelines, and in severe cases, trigger the engine warning light. A dirty air filter that hasn't been cleaned regularly can cause intake problems. Exhaust Issues: Exhaust system faults can also illuminate the engine warning light. Common causes include faults in the rear oxygen sensor, catalytic converter, exhaust camshaft, and bearings, with the catalytic converter being the most frequent issue. Using leaded gasoline, lead- or silicon-containing lubricant additives, physical damage to the catalytic converter, or fuel system malfunctions can easily lead to catalytic converter failure. Anti-Theft System Malfunction: If the car's electronic anti-theft system malfunctions or if there's a mismatch between the anti-theft controller and the engine ECU, the anti-theft system can prevent the engine from operating normally, accompanied by the illumination of the engine warning light. Steps to Take When the Engine Warning Light Illuminates: First, check if the engine is running normally, looking for issues like 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 and wait 5-10 minutes. 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-inspection mode upon powering up. After 5-10 seconds, observe whether the warning light on the dashboard turns off. If the warning light remains on, visit a service station as soon as possible. Technicians can use a portable diagnostic tool to read the fault codes, identify the issue, and perform targeted repairs.
