Why does the engine malfunction indicator light come on in a new car?

[VonEmiliano]

New car engine malfunction indicator light comes on because there is a fault in the engine. This situation in a new car is considered a factory quality issue, and it is recommended that the owner promptly visit a 4S dealership to request warranty repair. After the engine has been used for a period of time, carbon deposits will accumulate, which can lead to engine damage, difficulty starting, poor acceleration, excessive engine noise, and other phenomena. The accumulated heat can cause irregular engine ignition, leading to engine knocking. In such cases, the engine malfunction indicator light will illuminate. Carbon deposits in the engine should be cleaned regularly, typically every 40,000 to 50,000 kilometers. Some owners wait until the malfunction indicator light comes on before checking and cleaning the carbon deposits on the engine.

[DelKatherine]

I just bought a new car and the engine warning light came on, which is really frustrating. A new car should be perfect, but such issues are actually not uncommon. One common reason is overly sensitive sensors, such as the oxygen sensor falsely reporting abnormal engine operation, or temporary faults in the emissions system causing excessive emissions. Another possibility is a minor software bug, where the vehicle's system hasn't been fully debugged, especially during the break-in period. Sometimes, a loose fuel cap can also trigger the light, as air leakage causes a false alarm. Don’t rush to drive long distances, as small issues could escalate into engine damage. It’s recommended to contact the 4S店 immediately—they can use diagnostic tools to read the error codes and pinpoint the cause. New cars come with warranty coverage for free repairs. Remember, the warning light is a safety signal; don’t ignore it.

[DiTalia]

As a seasoned driver with over 20 years of experience, I'm not surprised to see warning lights illuminate in new cars. During the break-in period, the engine control system is still adapting to your driving habits, which may trigger the lights. Common causes include uneven fuel injection or temporary ignition system imbalances, often due to low-quality fuel. Sensor calibration deviations could also briefly activate the warning light - occasional flashes are harmless, but persistent illumination requires inspection. I recommend first checking your fuel cap tightness and fuel quality, then observing if the light resets after restarting. If unresolved, visit the dealership; their professional diagnostic tools can quickly read trouble codes for efficient resolution. Avoid DIY repairs that might void warranty - prioritizing smooth driving is wisest.

[VivienneAnn]

New car engine warning light on? Mostly minor electronic glitches. Modern cars have dense sensor networks that trigger alerts at the slightest irregularity - like loose wiring causing signal loss, or dirty emission sensors causing false alarms. Software might also be out of date and need updating. Check if the fuel cap is loose; simply tightening it and restarting may turn off the light. If the light stays on or flashes continuously, visit a shop for diagnostic scanning to pinpoint issues like pressure sensors or fuel lines. Not a major problem but requires timely attention to prevent small issues from affecting performance.