What causes the check engine light to come on?

What causes the check engine light to come on?


What causes the check engine light to come on?When the check engine light illuminates, it doesn't automatically mean that an automotive disaster is looming. Still, it's always best to get to the shop for computerized diagnostics so that you don't risk needing expensive repairs that could've been nipped in the bud. Here's a look at seven common check engine light triggers.

Faulty Ignition Coil

Ignition coils play a central role in creating the spark necessary for your engine to fire up on all cylinders. Misfiring and rough idling are signs of an ignition coil issue. Sometimes, extreme weather causes ignition coils to fail.

Bad Mass Air Flow Sensor

Air flow sensors keep tabs on the amount of incoming air and determine how much fuel should be injected with it. There could be a mass air flow sensor problem if your car stalls right after you start it up.

Faulty Oxygen Sensor

Oxygen sensors monitor the level of unburned oxygen that is in the exhaust system. Oxygen sensor trouble can lead to issues with the catalytic converter.

Failing Catalytic Converter

The catalytic converter does the important task of turning carbon monoxide into an emission that is less harmful to the environment. Indications of catalytic converter trouble include poor acceleration and dark exhaust smoke.

Failing Spark Plugs

As a general guideline, older vehicles should have their plugs changed every 30,000 miles. For vehicles built after 2000, you can often go 100,000 miles before plug replacement.

Bad Battery/Charging System

A failing battery can lead to low voltage at the computer, which can consequently cause the check engine light to turn on.

Loose or Poorly-Fitting Gas Cap

A loose or missing gas cap could cause fuel to evaporate before you even get the opportunity to use it. As strange as it may seem, this issue can actually cause the check engine light to illuminate.

If you need check engine light diagnostics and repair, be sure to bring your vehicle to a reputable mechanic. For auto repair in Margate, Coral Springs, Pompano Beach, and Coconut Creek, FL, contact the experts at J & C Car Repair at (954) 504-9484. Feel free to give J & C Car Repair a call today to schedule an appointment for any of your vehicle's repair or maintenance needs!


J & C Car Repair Blog
Posted: September 23, 2020

Written and Published By MORBiZ



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