What is making my check engine light turn on?

What is making my check engine light turn on?


What is making my check engine light turn on?An illuminated check engine light doesn't automatically signify that your engine is about to fail. But you'll still want to promptly get your car to the shop for accurate diagnostics so that any emerging problems can hopefully be nipped in the bud. Here's a look at seven reasons the check engine light comes on.

Failing Catalytic Converter

The catalytic converter does the crucial job of turning carbon monoxide into an emission that isn't as damaging to the environment. Signs of catalytic converter trouble include dark exhaust smoke and poor acceleration.

Bad Oxygen Sensor

Oxygen sensors monitor the amount of oxygen that's present in the exhaust system. This tells the engine if it needs to make any adjustments to improve operating efficiency. An oxygen sensor issue can cause trouble with the catalytic converter.

Faulty Mass Air Flow Sensor

Mass air flow sensors monitor how much air is entering and determine the amount of fuel that should be injected with it. A mass air flow sensor problem could cause your engine to stall shortly after you fire it up.

Bad Battery/Charging System

The check engine light could be triggered if a failing battery causes low voltage at the computer.

Faulty Spark Plugs

Misfiring spark plugs can hurt performance and fuel-efficiency. Oftentimes, vehicles made after 2000 can go 100,000 miles before they need new plugs, while older vehicles tend to need plug replacement more frequently.

Poorly Fitting Gas Cap

Though it might seem bizarre, a loose or missing gas cap can potentially trigger the check engine light, and may also allow fuel to evaporate before you get the chance to use it.

Failing Ignition Coil

Healthy ignition coils are crucial to generating the spark that your engine needs to come roaring to life. Ignition coil issues can cause misfiring and power loss.

If you need auto repair, be sure to bring your vehicle to a reputable mechanic. For check engine light diagnostics and repair in Belvidere, Cherry Valley, Loves Park, Machesney Park, and Rockford, IL, contact the experts at Integrity Auto Care at (815) 566-8357. Feel free to give Integrity Auto Care a call today to schedule an appointment for any of your vehicle's repair or maintenance needs!


Integrity Auto Care Belvidere Blog
Posted: November 29, 2020

Written and Published By MORBiZ


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