checkengine

The check engine light, also known as the Malfunction Indicator Lamp (MIL), is a warning light on the dashboard of a vehicle. It illuminates when the vehicle's onboard diagnostic system (OBD-II) detects a problem with the engine, transmission, or emissions system. The light can illuminate in two ways: a steady glow or a flashing pattern. A steady light generally indicates a less urgent issue, while a flashing light signifies a more severe problem that requires immediate attention to prevent further damage.

When the check engine light comes on, the OBD-II system stores a diagnostic trouble code (DTC) that can be read by a mechanic or by using a specialized scanner. These codes help technicians pinpoint the source of the problem. Common reasons for the check engine light to illuminate include a loose or faulty gas cap, issues with the oxygen sensor, problems with the catalytic converter, spark plug or ignition coil failures, and issues with the mass airflow sensor.

Ignoring a steady check engine light can lead to decreased fuel efficiency, increased emissions, and potentially more serious and expensive repairs down the line. A flashing check engine light should never be ignored, as it often indicates a misfire that can quickly damage the catalytic converter. Addressing the issue promptly is crucial for maintaining the vehicle's performance and longevity.