What is the main cause of the check engine light coming on?

A loose fuel cap is one of the most common reasons why the check engine light turns on. The cap is a crucial part of a car’s fuel delivery system. … 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.

How do you fix a check engine light?

If the check engine light comes on, here are some tips on what you should do:

  1. Look for a serious problem that requires immediate attention. …
  2. Try tightening your gas cap. …
  3. Reduce speed and load. …
  4. Use built-in diagnostic services, if available.

Can a check engine light come on for no reason?

Something as simple as forgetting to replace the gas cap could cause your “check engine” light to come on. … Faulty ignition – Spark plugs ignite the fuel as it flows through the engine’s cylinders. Failing to replace a spark plug could lead to catalytic converter failure or other serious problems.

How urgent is the check engine light?

Unlike a Temperature or Oil Pressure light, a Check Engine light is usually not an urgent, “Stop right now or you may cause permanent damage!” type of situation, unless it is flashing. … If your vehicle’s gas cap was loose, it may require some driving and an overnight “parked” period before the light will reset itself.

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What could be wrong when check engine light is on?

The light could be a minor issue, such as a faulty gas cap, or it could mean something more serious, such as a misfiring engine. … 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.

Can AutoZone reset 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.

Can a check engine light come on for oil change?

Your Car Needs an Oil Change

An illuminated check engine light is the first warning sign that your vehicle needs an oil change. It can activate because the oil is too dirty or when there’s not enough flowing throughout the engine. … If it’s dark, black in color, or too low, schedule an oil change today.

Where can I get my engine light checked for free?

At a local auto parts store

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

How much does it cost to fix check engine light?

The costs to fix whatever’s ailing your car — and causing the light to come on — can vary greatly. Repair costs for the most common check engine light problems range from under $20 to almost $1,200, according to CarMD’s analysis of millions of repairs recommended in 2016 in the U.S.

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