FAQ: What Can Cause Check Engine Light To Come On?

What is the most common reason for check engine light?

Replacing a faulty oxygen sensor — a sensor used to optimize a vehicle’s fuel-to-air mixture to increase gas mileage and reduce emissions — is the most common cause for a check engine light.

Why did my check engine light come on all of a sudden?

A loose fuel cap is one of the most common reasons why the check engine light turns on. If your check engine light turns on immediately after a fill-up, pull over and make sure the cap isn’t loose — or still on your car’s roof.

Can check engine light come on for no reason?

Fuel System Issues

Faulty gas cap – Your vehicle is pretty good at warning you of any potential trouble. Something as simple as forgetting to replace the gas cap could cause your “check enginelight to come on. When the MAF sensor goes out, your car no longer reads these important levels.

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Is check engine light serious?

The check engine light — more formally known as the malfunction indicator lamp — is a signal from the car’s engine computer that something is wrong. If the light begins flashing, however, it indicates a more serious problem, such as a misfire that can quickly overheat the catalytic converter.

Will check engine light reset itself?

Your vehicle’s check engine light will will reset by itself once the issue or problem has been repaired; this is true for most models. If you are certain that you have resolved the issue that caused your check engine light to come on in the first place, then the light should reset itself after at least 20 cycles.

Will a dirty air filter cause a check engine light?

A dirty air filter is one of the things that can cause your Check Engine light to come on, caused by an inadequate supply of air to the engine that results in a buildup of carbon deposits. Have your mechanic scan your vehicle to track down the source of the problem, as it could be as simple as replacing the air filter.

Can AutoZone check engine light?

Does AutoZone Scan Check Engine Lights? AutoZone does. If your light is on, and you are wondering why, head down to your local AutoZone where one of our store associates can help diagnose the issue through our free Fix Finder service.

Where do I go when my check engine light is on?

However, a flashing engine check light indicates that it is a serious problem that requires your immediate attention. If you see a flashing light, it’s best to contact a mechanic as soon as possible to prevent serious damage. To protect your vehicle—and avoid costly repairs—seek a mechanic’s help as soon as possible.

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What to do if check engine light is on?

What to Do About the Check Engine Light

  1. Look for a serious problem that requires immediate attention. Check your dashboard gauges and lights for indications of low oil pressure or overheating.
  2. Try tightening your gas cap.
  3. Reduce speed and load.
  4. Use built-in diagnostic services, if available.

Who does check engine lights for free?

FREE Check Engine Light Help is one of several free services offered by O’Reilly Auto Parts. Here are some others: FREE Battery Testing.

Can low coolant cause a check engine light?

Low coolant in the radiator of your car can trigger the malfunction illumination light (MIL), also known as the “check enginelight. Low coolant can affect the internal temperature of the engine, which is protected by the antifreeze.

How do you check engine light?

Check the codes yourself

Bluetooth OBD2 Scan Tool for Android: Connect this device, then open an app like Torque Pro on your Android tablet or phone, which connects to the device via Bluetooth. You can then get the codes, reset the check engine light, along with a host of other things.

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