WHY IS MY CHECK ENGINE LIGHT ON? DIAGNOSIS | UNDERSTANDING THE REASONS
WHY IS MY CHECK ENGINE LIGHT ON? DIAGNOSIS | UNDERSTANDING THE REASONS If your car's MALFUNCTION INDICATOR or CHECK ENGINE LIGHT is on, here are several common reasons why it might be illuminated.
Faulty oxygen sensor. This component, measures the amount of oxygen in the exhaust gases, and affects the air-to-fuel ratio during the combustion process.
Faulty gascap. A loose or damaged gascap, can cause a vacuum leak, and trigger the check engine light.
Defective catalytic converter. If this part fails, it can lead to increased emissions, and decreased engine performance.
Faulty sparkplugs or ignition coils. These can cause misfiring, resulting in rough idling, and increased emissions.
Low oil pressure. Insufficient lubrication can damage your engine, and decrease performance.
Dirty or defective mass airflow sensor. This can disrupt the engine's performance, and trigger the check engine light.
Faulty throttle position sensor. It can affect acceleration, idle speed, and emissions.
Faulty Exhaust Gas Recirculation Valve. This valve reduces harmful emissions, and any issues can trigger the check engine light.
Leak in the EVAP system. A damaged gascap or cracked hoses, can cause fuel vapors to escape, triggering the check engine light.
Fault in the Anti-lock Braking System. While not directly linked to the check engine light, A.B.S. issues can trigger the C.E.L., if shared components are affected.
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