What Causes the Engine Fault Light to Illuminate After Battery Replacement?

[DaisyLee]

The reasons for the engine fault light illuminating after battery replacement are: 1. Poor gasoline quality leading to incomplete combustion of the air-fuel mixture in the cylinders, resulting in carbon buildup; 2. Excessive engine mileage causing weakened spark plug performance; 3. Aging vehicle components; 4. Damage, poor contact, or signal interruption in sensors such as coolant temperature, crankshaft position, air flow, intake air temperature, and oxygen sensors. Hazards of an illuminated engine fault light: 1. Degraded exhaust gas quality and increased environmental pollution; 2. Elevated combustion chamber temperature and accelerated wear, leading to premature engine damage; 3. Engine oil consumption; 4. Increased engine noise, affecting driving and passenger comfort.