While an illuminated check engine light doesn’t always mean a major repair is needed, it should never be ignored. This warning light is part of your vehicle’s onboard diagnostic system and can indicate a wide range of issues, from minor malfunctions to serious engine trouble. At Gab’s Auto Repair, we provide expert check engine light diagnostics and repair in the greater Phoenix area. Here are five common reasons the check engine light may turn on.

Malfunctioning Mass Airflow Sensor

The mass airflow (MAF) sensor measures the amount of air entering the engine and helps ensure the proper air-to-fuel ratio for combustion. A malfunctioning MAF sensor can lead to poor acceleration, rough idling, and decreased fuel-efficiency. Replacing a faulty MAF sensor is a relatively straightforward repair that can improve overall performance.

Failing Ignition Coils or Spark Plugs

Spark plugs and ignition coils play a crucial role in igniting the air-fuel mixture. When they start to fail, the engine may misfire, hesitate during acceleration, or run roughly. Regular maintenance, including replacing spark plugs at the recommended intervals, can help prevent this issue from triggering the check engine light.

Catalytic Converter Problems

The catalytic converter is responsible for reducing harmful emissions by converting pollutants into less harmful gases. If it has a problem, the check engine light will likely illuminate. A failing catalytic converter can lead to poor engine performance, reduced fuel-economy, and increased emissions. 

Faulty Oxygen Sensor

The oxygen sensor monitors the level of unburned oxygen in the exhaust system and helps regulate the air-fuel mixture. If the sensor becomes faulty, it can cause the engine to run inefficiently, leading to reduced fuel-economy and increased emissions. If left unaddressed, it can lead to issues with the catalytic converter.

Loose or Faulty Gas Cap

Something as simple as a loose or damaged gas cap can trigger the check engine light. The gas cap seals the fuel system, and if it’s not tightly secured, fuel might evaporate before your engine gets the chance to put it to use.

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 to make an appointment!