Why is the Check Engine Light On?


So the check engine light came on and now it is staring you down every time you get in your car. With every mile you travel the problem that the light is trying to tell you about is likely getting worse and worse, resulting in a need for more expensive and time consuming repairs. The problems the light is telling you about are generally a warning about bigger issues that could happen if your vehicle is not serviced. You should never delay getting the check engine light diagnosed by a professional auto mechanic and having the found issue repaired. Here are 4 common check engine light problems.

Faulty Ignition Coil

The ignition coil produces the spark necessary to get your car's engine started and is subject to harsh wear and tear. If the vehicle's ignition is going bad the light can be triggered. Other common symptoms you may endure if this is the issue include hard starting or a tough to turn key.

Bad Mass Air Flow Sensor

Your vehicle runs on a mix of air and gasoline and the mass air flow sensor monitors incoming air and calculates how much gasoline it needs to be mixed with to ensure the engine runs right. If the sensor malfunctions the light will glow. This is usually an inexpensive, but very important fix. If your MAF sensor goes bad it can cause fuel efficiency to drop by up to 25 percent.

Loose or Broken Gas Cap

One of the most inexpensive problems you can hope for is a loose or broken gas cap. If a gas cap is cracked or not fitted correctly gasoline can evaporate out the filler hose which will trigger the light. To avoid a trip to the auto repair shop for a fix that costs next to nothing make sure your cap is tight every time you fill up.

Cylinder Misfire

If you vehicle's engine misfires the light will turn on. Symptoms of this include a stuttering or hard to start engine, poor acceleration and rough idle. The actual problem could be related to a vacuum leak, bad spark plugs or something that requires major repair like a cracked cylinder head.

There are many, many things that can cause the check engine light to turn on and a problem with one system can cause issues in others if not quickly dealt with. If you need check engine light diagnostics in Fitchburg head to AAA approved Tom's Automotive. We utilize modern diagnostic and repair equipment, ensuring efficient and affordable repairs, every time. We conduct import and domestic repair, so please don't hesitate to reach out to us anytime your car is giving you trouble. Give Tom's a call at (978) 331-1257 to schedule an appointment for expert auto repair in Fitchburg today. We proudly offer a warranty with our services!

Tom's Automotive Blog

Written By Brian Corey

Published By MORBiZ