What Causes the Engine Light to Come On in a Car?

[JaylaDella]

Engine light illumination can be caused by sensor issues, turbocharging problems, or exhaust system malfunctions. Below are the specific reasons for the engine light coming on: Sensor Issues: Sensors include coolant temperature, crankshaft position, air flow, intake air temperature, and oxygen sensors. When these sensors are damaged, have poor connections, or experience signal interruptions, the vehicle's ECU cannot accurately obtain engine data, triggering the engine warning light. Turbocharging Problems: Intake boost piping and turbochargers can also cause the engine warning light to illuminate. The most common issue is turbocharger damage, often accompanied by symptoms such as oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Exhaust System Issues: Components include rear oxygen sensors, catalytic converters, exhaust camshafts, and bearings. The most frequent cause is catalytic converter failure. Factors leading to catalytic converter malfunction include using leaded gasoline, lead/silicon-based lubricant additives, physical damage to the converter, or fuel system failures.