Why does the engine light sometimes turn on and sometimes off?

[TaliaAnn]

The engine warning light sometimes turning on and sometimes off indicates there is an issue with the engine. The intermittent nature of the light suggests the problem is not yet severe. When the issue does not affect normal driving, the engine warning light will turn off, but it will illuminate when a fault is detected. Common causes include: 1. Excessive carbon buildup in the throttle body or engine internals. 2. A faulty oxygen sensor leading to an imbalance in the air-fuel mixture. This often occurs with prolonged low-speed city driving. 3. Fuel injector leakage causing continued fuel supply after throttle release, resulting in an overly rich mixture at low speeds and unstable idle. In severe cases, this may cause the engine to stall. 4. Use of substandard gasoline with excessive metal content, poisoning the oxygen sensor. The solution is to switch to a different gas station.