Why is My Check Engine Light On?

A check engine light is the small engine-shaped icon on the instrument dashboard. It glows orange when there's something wrong with your vehicle. If you see your check engine light blinking, any of the following reasons could be to blame:


Top 10 Reasons Why Your Check Engine Light is On

1. Battery Failure
Your check engine light may be indicating a dead battery. Consider installing an advanced battery monitoring system to detect battery failures early.
2. A Disturbed Gas Cap
The vapors that escape from a loose gas cap can trigger the check engine light.
3. Aftermarket Alarm Issues
An alarm that's incompatible with the vehicle's existing systems can trigger the check engine light. So use only manufacturer-certified alarms to avoid such technical issues.
4. Faulty Spark Plugs
Spark plugs are needed to power up your engine. If they are worn out or damaged, your engine will not be performing to its optimal potential, which results in waste of gas.
5. Problematic Ignition Coil
Your check engine light may be indicating a compromised ignition coil. This coil generates power for your vehicle’s spark plugs and can be damaged by age or high temperatures.
6. Mass Airflow Sensor Issues
A mass airflow sensor measures the amount of air entering your vehicle’s engine. A faulty sensor can lead to several problems, including under-mileage and engine starting difficulties.
7. Problems With Exhaust Gas Recirculation Valve
This valve recirculates exhaust gases and reduces fuel emissions. A clogged valve or sudden valve failure could be responsible for your check engine light.
8. Catalytic Converter Problems
A catalytic converter’s function is to turn the carbon monoxide generated during fuel combustion into carbon dioxide. Discolored smoke emanating from the exhaust or an oily exhaust are indications of a faulty catalytic converter.
9. An Issue With Vehicle’s Oxygen Sensor
The oxygen sensor measures oxygen levels in the exhaust system and sends the data to your vehicle’s computer, which then adjusts the air-fuel mixture entering the engine accordingly. A faulty sensor leads to more gas consumption, reduced mileage, and slow damage to components such as spark plugs.
10. Vacuum Hose Leakage
A leaky vacuum hose cannot route evaporating fuel to its destined vent, which may have triggered the check engine light.


If you're near Belmar, Asbury Park, or Freehold, visit our Kia service center at Sansone Jr's 66 Kia in Neptune, NJ. We can thoroughly examine your car and ascertain why the check engine light has been active.