Can Bad Gasoline Cause the Engine Malfunction Light to Illuminate?
2 Answers
If the engine malfunction light comes on after refueling, it indicates that poor-quality fuel has been added. During the combustion process in the engine, due to the high impurity content and low combustion efficiency of inferior fuel, some impurities and unburned fuel accumulate in the combustion chamber, occupying space and subsequently causing the engine malfunction light to illuminate. Solution: Promptly drain the inferior fuel and clean the fuel tank and fuel lines. After cleaning, replace it with high-quality fuel. Besides fuel quality issues, the following reasons can also cause the engine malfunction light to illuminate: Sensor Malfunction: The sensors mentioned here include coolant temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or their signals are interrupted, the vehicle's ECU cannot accurately obtain engine data, leading to the illumination of the engine malfunction light. Poor Combustion of Air-Fuel Mixture: Poor combustion of the air-fuel mixture can cause 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 pump, or clogged fuel lines can all lead to poor combustion of the engine air-fuel mixture. Turbocharger Issues: The intake boost pipes and turbocharger can also cause the engine malfunction light to illuminate. The most common issue is a damaged turbocharger, accompanied by symptoms like oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Intake Issues: If there are problems with the car's intake, it can lead to clogged engine pipes, and in severe cases, cause the engine malfunction light to illuminate. A dirty air filter that hasn't been cleaned regularly can lead to intake problems. Exhaust Issues: Exhaust faults can also cause the engine malfunction light to illuminate. 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-based lubricant additives, physical damage to the catalytic converter, or faults in the engine fuel supply system can easily cause catalytic converter issues. Anti-Theft System Fault: If the car's electronic anti-theft system malfunctions or if the anti-theft controller doesn't match the engine electronic controller, the anti-theft system can prevent the engine from operating normally and cause the engine malfunction light to illuminate.
Yes, poor-quality gasoline can indeed cause the engine malfunction light to come on. I've been in auto repair for over a decade and have seen many such cases. Inferior gasoline may contain impurities or have too low an octane rating. When combustion is incomplete, the oxygen sensor or knock sensor detects abnormalities and sends signals to the ECU, triggering the warning light. This can also lead to other issues like reduced engine power or a sudden spike in fuel consumption. It's best to choose fuel from reputable gas stations and avoid low-grade products from shady vendors. If the light comes on, don't delay—stop to check the fuel quality first. If necessary, take it to a shop to inspect the circuits or clean the fuel system. Regular maintenance is also crucial to keep sensors clean and prevent false alarms. Engine health affects driving safety, so it never hurts to be extra careful.
