7 Common Reasons that the Check Engine Light Illuminates

7 Common Reasons that the Check Engine Light Illuminates


While an illuminated check engine light doesn't necessarily mean that a disaster is looming, it's still best to get to the shop for computerized diagnostics so that any developing problems can be nipped in the bud before they require more costly repairs. Here's a look at seven reasons the check engine light turns on.

Bad Mass Air Flow Sensor

Mass air flow sensors track the amount of incoming air and determine how much fuel needs to be injected with it. An indication of a failing mass air flow sensor is that your engine stalls out soon after you fire it up.

Failing Catalytic Converter

It's important to drive with a properly functioning catalytic converter so that carbon monoxide is successfully turned into an emission that is less damaging to the environment. Worsening acceleration and dark exhaust smoke are two signs of catalytic converter trouble.

Faulty Oxygen Sensor

Oxygen sensors keep tabs on the quantity of unburned oxygen in the exhaust system. A bad oxygen sensor can cause a reduction in fuel-efficiency and problems with the catalytic converter.

Failing Spark Plugs

Failing spark plugs can cause worsening performance and gas mileage. It's generally recommended that older vehicles get their plugs changed every 30,000 miles or so. For vehicles made after 2000, you can often go 100,000 miles before replacing plugs.

Loose or Missing Gas Cap

While it might sound bizarre, a loose gas cap sometimes causes the check engine light to turn on. You'll want to always drive with a properly sealed gas cap so that fuel doesn't evaporate before you get the chance to use it.

Bad Battery/Charging System

When a battery fails, it can cause low voltage at the computer. This can then trigger the check engine light.

Failing Ignition Coil

To create the spark necessary for your vehicle to properly fire up on all cylinders, you need healthy ignition coils. Signs of ignition coil failure include misfiring and a loss of power. If you need check engine light diagnostics & repair, be sure to bring your vehicle to a reputable mechanic. For auto repair in Winston, Combee Settlement, and Lakeland, FL, contact the experts at Willie Automotive & Towing Service at (863) 777-5591. Willie Automotive also offers roadside assistance in Lakeland, FL. Feel free to give Willie Automotive a call today to schedule an appointment for any of your vehicle's repair or maintenance needs!


Willie Automotive & Towing Service Blog
Posted: September 30, 2020

Written and Published By MORBiZ