The check engine light is a vital part of your car's diagnostic system, designed to alert you to potential issues under the hood. Understanding the common reasons it illuminates can help you address problems promptly and avoid more expensive repairs. At Auto Check Complete Car Care, we provide expert check engine light diagnostics and repair in the greater Katy, TX area. Here’s a look at five common reasons the check engine light illuminates.

Oxygen Sensor Failure

The oxygen sensor measures the amount of unburned oxygen in the exhaust system, helping to ensure a proper air-fuel mixture. A faulty oxygen sensor can lead to decreased fuel-efficiency and increased emissions. 

Catalytic Converter Issues

The catalytic converter is a crucial component that helps reduce harmful emissions by converting exhaust gasses into less harmful substances. If it's malfunctioning, it can cause the check engine light to turn on. Symptoms of catalytic converter problems include reduced engine performance and a smell similar to rotten eggs. 

Mass Airflow Sensor Problems

The mass airflow (MAF) sensor measures the amount of air entering the engine and helps determine the correct amount of fuel to inject. If the MAF sensor is dirty or faulty, it can disrupt the air-fuel mixture, causing the engine to run poorly. 

Loose or Faulty Gas Cap

One of the simplest and most overlooked causes of the check engine light is a loose or faulty gas cap. The gas cap seals the fuel system. If it's not properly tightened or if it's cracked, fuel may evaporate before you get the chance to run on it. 

Spark Plug or Ignition Coil Issues

Spark plugs and ignition coils are essential for igniting the air-fuel mixture in the engine's cylinders. Worn-out spark plugs or faulty ignition coils can lead to misfires, causing the check engine light to illuminate. This issue can typically be fixed by replacing the faulty components.

Check Engine Light Repair in Katy, TX

When you need engine diagnostics and repair in Katy, contact Auto Check Complete Car Care at (281) 815-2351. Feel free to give us a call today to schedule an appointment!