An illuminated check engine light doesn’t automatically mean that your engine is on the verge of catastrophe. Still, you should get to the shop for computerized diagnostics so that the issue that’s triggering the light can be identified and addressed before it causes bigger problems. At Gab’s Auto Repair, we provide expert check engine light diagnostics and repair in the greater Phoenix area. Here are some of the most common reasons the check engine light turns on.

Faulty Oxygen Sensor

One of the most frequent culprits behind a check engine light is a faulty oxygen sensor. These sensors monitor the amount of oxygen in the exhaust gasses and help the engine adjust its fuel mixture for optimal performance and fuel efficiency. When an oxygen sensor malfunctions, it can lead to reduced gas mileage and increased emissions. 

Mass Airflow Sensor Problems

The mass airflow sensor (MAF) measures the amount of air entering the engine, allowing the computer to adjust the fuel-to-air ratio. When the MAF sensor malfunctions, it can lead to poor engine performance and fuel economy, as well as trigger the check engine light. 

Faulty Catalytic Converter

The catalytic converter is a critical part of your vehicle's emission control system. It converts harmful gasses from the exhaust into less harmful ones. A failing catalytic converter can cause worsening acceleration and a smell similar to rotten eggs. 

Loose or Missing Gas Cap

Believe it or not, something as simple as a loose or damaged gas cap can trigger the check engine light. A loose gas cap can allow fuel vapors to escape, leading to an evaporation system error. 

Spark Plug and Ignition System Issues

The spark plugs and ignition system are essential for the proper combustion of fuel in your engine. When spark plugs wear out or ignition components fail, it can result in misfiring, reduced engine performance, and an illuminated check engine light. 

Check Engine Light Diagnostics & Repair in Phoenix, AZ

When you need auto repair in Phoenix and the surrounding area, contact Gab’s Auto Repair at (602) 780-3118. Feel free to give us a call today to make an appointment!