Why does the Cruze engine malfunction indicator light come on?

[MacGabriela]

The engine malfunction indicator light may come on for the following 7 main reasons: Sensor failure: The sensors referred to here include those for coolant temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or experience signal interruption, the vehicle's ECU cannot accurately obtain engine data, which can trigger the engine malfunction indicator light. Fuel quality issues: If fuel and engine oil are not added according to the manufacturer's requirements, it may cause engine wear, leading to the malfunction indicator light coming on. Poor combustion of the 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 malfunction indicator light will illuminate as a warning. Issues such as spark plug failure, ignition coil failure, fuel pump failure, or fuel line blockage can all cause poor combustion of the air-fuel mixture. Turbocharging problems: The intake turbocharging pipeline and turbocharger can also cause the engine malfunction indicator 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 pipe. Intake problems: If there is an issue with the vehicle's intake, it may cause engine pipeline blockage, and in severe cases, trigger the engine malfunction indicator light. A dirty air filter that is not cleaned regularly can lead to intake problems. Exhaust problems: Exhaust system failures can also cause the engine malfunction indicator light to come on. Common causes include issues with the rear oxygen sensor, catalytic converter, exhaust camshaft, and bearing failures, with the catalytic converter being the most frequent culprit. Using leaded gasoline, lead or silicon-based lubricant additives, physical damage to the catalytic converter, or fuel system failures can easily cause catalytic converter issues. Anti-theft system failure: If the vehicle's electronic anti-theft system malfunctions or if the anti-theft controller does not match the engine electronic controller, the anti-theft system can prevent the engine from operating normally, and the engine malfunction indicator light will illuminate. If the engine malfunction indicator light comes on, follow these steps: First, check if the engine is running normally, looking for symptoms 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 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 vehicle will enter self-test mode after powering on. Wait 5-10 seconds to see if the malfunction indicator light turns off. If the light remains on, visit a service center as soon as possible. The service center can use a portable diagnostic tool to read the fault codes, identify the issue, and perform targeted repairs.