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What Does It Mean When Your Check Engine Light Turns On? August 22, 2017

East Haven, New Haven County
What Does It Mean When Your Check Engine Light Turns On?, East Haven, Connecticut

Seeing the check engine light on your dashboard can be confusing, especially if your car feels like it’s operating normally. This alert is designed to tell you when there is a problem under the hood, meaning the vehicle needs professional attention. Since the light signifies several potential issues, it’s helpful to understand a few of the most common causes for the notification. 

3 Reasons Your Check Engine Light Turns On

Faulty Fuel Cap

The check engine light will tell you when there is something wrong with the gas cap. In most cases, it isn’t screwed on all the way. However, if the light stays on even after tightening the cap, you need to see a mechanic for car service. They will check the area to make sure there are no cracks in the seal that allow fuel to evaporate, decreasing the pressure in the tank. 

Damaged Oxygen Sensor

check engine light New Haven CTYour vehicle’s oxygen sensors monitor the engine’s performance and emissions. If one of these devices is damaged or dirty, it won’t work properly, which can harm the engine and prevent you from passing an inspection. If the car’s onboard computer detects a problem with one of the oxygen sensors, it will activate the check engine light, so you know it’s time to get an auto engine repair.

Frayed Plug Wires

Cars depend on spark plugs and wires to ignite the fuel, so it provides power. If the parts are damaged or ineffective due to age, they may send faulty or incomplete signals, impacting the vehicle’s performance and causing the check engine light to turn on. Mechanics recommend having the plugs and wires inspected every time you get an oil change, so you can replace them during the same car service.


The next time your check engine light turns on, make an appointment with the experts at Affordable Transmissions in New Haven, CT. They will evaluate your vehicle to determine the cause of the alert and perform the necessary tuneup or repair. Their engine light diagnostic service is free, making the situation less stressful. Visit the shop online or call (203) 466-6580 for more information.