FAQ: Reasons Why Check Engine Light Goes 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.

Should I be worried if my check engine light is on?

If the check engine light illuminates, it will either blink or remain constantly illuminated, depending on the problem. A blinking light, or in some cars a red light instead of a yellow or orange light, indicates a problem that needs immediate attention. Either way, you should have the vehicle checked by a mechanic.

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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.

Can AutoZone reset check engine light?

Originally Answered: Can AutoZone turn off the check engine light? Yes, Autozone can use a scanner to read and clear DTC’s.

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.

How long before check engine light goes off after gas cap?

In general when you clear the check engine light you need to drive the car around for some time, 50–100 miles normally. If you do not do this then the vehicle will not pass an emissions test because there is not enough data recorded in the computer system.

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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Who does free check engine light diagnosis?

At a local auto parts store

  • Advance Auto Parts.
  • AutoZone.
  • Napa Auto Parts.
  • O’Reilly Auto Parts.
  • Pep Boys Auto Parts.

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