Here's what you should do:
1. Get the codes read. The check engine light is triggered by a fault code stored in your car's computer. A mechanic will use an OBD-II scanner to read these codes. This is the first step to understanding what's wrong.
2. Don't ignore it. Leaving the check engine light on can lead to more serious problems and potentially expensive repairs down the line.
3. Consider the symptoms. Pay attention to any other unusual sounds, smells, or driving changes you've noticed. This can help the mechanic diagnose the issue.
Common Reasons for a Check Engine Light in a 2004 Chevy Cavalier:
* Oxygen Sensor: This sensor monitors the exhaust and can fail, leading to poor fuel economy and emissions issues.
* Catalytic Converter: This part reduces harmful emissions and can fail due to age or a faulty oxygen sensor.
* Mass Airflow Sensor: Measures the amount of air entering the engine. A faulty sensor can affect engine performance.
* Spark Plugs & Wires: Worn spark plugs can cause misfires, affecting performance and fuel economy.
* Evaporative Emission System: This system prevents fuel vapors from escaping and can have leaks.
Remember: Without knowing the specific codes, it's impossible to diagnose the problem accurately. A mechanic can properly diagnose the issue and provide the best solution.
