Few dashboard warnings cause as much uncertainty as the check engine light. Sometimes it appears because of a relatively minor issue, while other times it indicates a problem that could cause significant engine or emissions-related trouble. Because the warning can be triggered by multiple systems, it's important not to ignore it simply because your vehicle still seems to run normally. At Proline Auto Care, we provide expert check engine light diagnostics and repair in the greater Naples, FL area. Here are four common issues that can cause the check engine light to illuminate. Faulty Oxygen Sensor Oxygen sensors monitor the amount of oxygen in your vehicle's exhaust and send information to the engine computer. This helps the computer adjust the air-fuel mixture for efficient engine operation. A failing sensor can contribute to poor fuel-economy, increased emissions, and changes in performance. If the check engine light appears alongside these symptoms, professional diagnostics can determine whether an oxygen sensor is responsible. Worn Spark Plugs Spark plugs ignite the air-fuel mixture inside a gasoline engine. Over time, they can become worn, fouled, or damaged, potentially causing engine misfires. A misfiring engine may run roughly and hesitate during acceleration, while the check engine light may also illuminate. Replacing spark plugs according to the manufacturer's maintenance recommendations can help support reliable engine operation. Catalytic Converter Problems The catalytic converter helps reduce harmful pollutants in your vehicle's exhaust. If it becomes damaged, clogged, or fails to operate efficiently, the vehicle's computer may detect a problem and activate the check engine light. A failing catalytic converter can sometimes be accompanied by reduced performance or declining fuel-economy. You might also notice a smell similar to rotten eggs. Mass Airflow Sensor Failure The mass airflow sensor measures the amount of air entering the engine, allowing the computer to determine how much fuel should be delivered. If the sensor becomes contaminated or fails, the engine may receive inaccurate information. This can lead to rough idling, hesitation, poor acceleration, reduced fuel-economy, and a check engine light. A technician can test the sensor and determine whether cleaning or replacement is appropriate. Check Engine Light Diagnostics and Repair in Naples, FL For expert auto repair in Naples and the surrounding area, contact Proline Auto Care at  239-497-8896  . Feel free to give us a call to schedule an appointment!