Why does the check engine light turn on?

Why does the check engine light turn on?


While an illuminated check engine light doesn't automatically mean that an automotive disaster is imminent, it's still best to get to the shop for diagnostics so that the problem doesn't worsen to the extent that you need major repair that could've been prevented. Here's a look at seven common check engine light triggers.

Failing Battery/Charging System

A faulty car battery can lead to low voltage at the computer, which can cause the check engine light to come on.

Faulty Ignition Coil

Ignition coils are an important part of the ignition system and are needed to create the spark for firing up. There could be ignition coil trouble if your engine is misfiring or poorly idling.

Bad Mass Airflow Sensor

Mass airflow sensors monitor the amount of incoming air and then determine how much fuel should be injected with it. One sign of mass airflow sensor trouble is inconsistent acceleration.

Failing Catalytic Convertor

The cat serves the important purpose of turning carbon monoxide into a less harmful emission. Indications of catalytic converter trouble include decreased acceleration and dark exhaust smoke.

Faulty Oxygen Sensor

Oxygen sensors oversee how much unburned oxygen is in the exhaust system. If an oxygen sensor develops issues, it may consequently cause problems with the catalytic converter.

Bad Spark Plugs

In older vehicles, the general guideline is that spark plugs should be replaced every 30,000 miles. For vehicles manufactured after 2000, you can often go 100,000 miles before plugs need to be replaced.

Loose/Missing Gas Cap

Though it might seem strange, a poorly fitting gas cap can actually cause the check engine light to turn on. It's important to have a tightly fastened gas cap so that fuel doesn't evaporate before you get the chance to use it.

If you need auto repair, be sure to bring your vehicle to a reputable mechanic. For check engine light diagnostics & repair in Schaumburg, Arlington Heights, and Palatine, IL, contact the experts at Import Motors at (847) 908-4863. Import Motors specializes in European auto repair in Schaumburg. Feel free to give Import Motors a call today to schedule an appointment for any of your vehicle's repair or maintenance needs!


Import Motors Inc Blog
Posted: August 19, 2020

Written and Published By MORBiZ