What to Do When the Buick Engine Malfunction Light is On and the Car Won't Start?

[MacCayden]

If the engine malfunction light is on, you can follow these steps: First, check whether the engine is running normally, such as whether there is shaking, black smoke, or difficulty starting. If any of these issues exist, try not to start the engine again. Note: Do not start the engine if the red light is on. If the engine is running normally and the car can be driven, go to a service station as soon as possible to diagnose the issue. The service station can easily read the fault code using a portable diagnostic tool to obtain targeted repair information. If the engine is running normally, the owner can also try gently reconnecting various wiring harness connectors, as a loose connection may be the cause. Alternatively, repeatedly turning the key to the ON position may help reset the system. Generally, the engine malfunction light may come on due to the following seven reasons: Sensor failure: Sensors such as the coolant temperature sensor, crankshaft position sensor, air flow sensor, intake temperature sensor, and oxygen sensor may be damaged, have poor contact, or experience signal interruption. When the ECU cannot accurately obtain engine data, the malfunction light will illuminate. Fuel or oil quality issues: If fuel or engine oil is not added according to the manufacturer's requirements, it may cause engine wear and trigger the malfunction light. Poor combustion of the air-fuel mixture: Poor combustion can lead to engine carbon buildup or knocking. When detected by the oxygen sensor and reported to the ECU, the malfunction light will illuminate as a warning. Issues such as faulty spark plugs, ignition coils, fuel pumps, or clogged fuel lines can cause poor combustion. Turbocharger problems: Issues with the intake boost pipeline or turbocharger can also trigger the malfunction light. The most common problem is turbocharger damage, which may also cause oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Intake problems: If there is an issue with the air intake, it may lead to engine pipe blockages, and in severe cases, trigger the malfunction light. A dirty air filter that is not cleaned regularly can cause intake problems. Exhaust problems: Exhaust system faults can also trigger the malfunction light. Common causes include faulty rear oxygen sensors, catalytic converters, exhaust camshafts, or bearings. The catalytic converter is the most frequently affected component. Using leaded gasoline, lead- or silicon-based lubricant additives, physical damage to the catalytic converter, or fuel system issues can all lead to catalytic converter failure. Anti-theft system failure: If the car's electronic anti-theft system malfunctions or the anti-theft controller does not match the engine ECU, the anti-theft system may prevent the engine from operating normally and trigger the malfunction light.