What Does a Constantly Illuminated UY125 Engine Warning Light Indicate?

[AngelinaDella]

There are primarily 7 reasons for an illuminated engine warning light: Sensor malfunction: This includes sensors such as coolant temperature, crankshaft position, air flow, intake 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. Fuel/oil quality issues: Failure to use the manufacturer-recommended fuel or engine oil may cause engine wear, leading to the warning light activation. Poor combustion of air-fuel mixture: Incomplete combustion can result in engine carbon buildup or knocking. When detected by the oxygen sensor and reported to the ECU, the warning light will illuminate as an alert. Causes include faulty spark plugs, ignition coils, fuel pump, or clogged fuel lines. Turbocharger problems: Issues with the intake boost piping or turbocharger (most commonly turbo failure) can trigger the warning light. Symptoms may include oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black exhaust smoke. Intake system issues: Clogged engine piping due to dirty air filters (not cleaned regularly) may severely affect intake airflow, activating the warning light. Exhaust system faults: Problems like faulty rear oxygen sensors, catalytic converter (most common), exhaust camshaft, or bearing failures can illuminate the light. Causes include using leaded gasoline, lead/silicon-based oil additives, physical damage to the catalytic converter, or fuel system malfunctions. Anti-theft system failure: If the electronic anti-theft system malfunctions or doesn't match the engine ECU, it may prevent normal engine operation while activating the warning light. When the engine warning light appears, follow these steps: 1. First check if the engine runs normally. If there's shaking, smoke, etc. (especially with a red light), avoid restarting. 2. For restartable engines: After 5-10 minutes of shutdown (without braking), press the start button or turn the key halfway to 'ON' position. The system will perform a 5-10 second self-check - observe if the warning light turns off. 3. If the light persists, visit a service center immediately. Technicians can read diagnostic trouble codes using scan tools for targeted repairs.