The majority of check engine lights are caused by common engine problems, including low oil pressure, misfire, and loose or dirty spark plugs. Of the top five most common causes of a check engine light, replacing a worn oxygen sensor, a device used to improve a vehicle's air-to-fuel ratio to improve gas mileage and lower emissions, is the most likely to affect a vehicle on a regular basis.

Because a check engine light indicates a problem in a vehicle's performance, it is necessary to conduct an immediate check of the problem before the light goes out. If the engine doesn't seem to be functioning properly, take the car to a certified mechanic who can perform a detailed check of the vehicle. A number of symptoms can indicate a problem with the vehicle's engine such as excessive smoke, high pressure or low fluid, and a lack of power, to name a few.

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When low mileage is seen, it may be necessary to replace the alternator, as it is often a contributor to low mileage. Other common low mileage causes include the alternator itself, a loose spark plug, poor fuel, a dirty spark plug, a worn cam chain, and a poor exhaust system. All of these items can cause low mileage, so they should be inspected to be sure that the alternator is not the cause.

There are a few other causes for check engine lights, but they are not as common as the others listed above. The most common of the remaining causes is a slow fuel filter, a clogged oil filter, or a loose or broken fuel cap.

An oil change to improve the vehicle's fuel system is another common cause. Replacing the oil filter, changing the oil, and changing the oil cap often, is also another common cause of a check engine light, as it can indicate that the fuel system is clogged.

Although many people don't consider the car's check engine light important, it is. The majority of vehicles have some sort of warning device built into them, and it is important to inspect the warning lights and other warning signs of an under-powered engine to ensure that the car is in good condition and running at optimum performance.

When a check engine light comes on, the vehicle should not be driven to the nearest repair shop without first performing the proper maintenance. If the vehicle isn't in good working order, a diagnosis will be needed, and the owner will be unable to diagnose any problems that are caused by mechanical failures or a dirty fuel filter. If the owner knows what the warning lights mean, he or she can correct the issues and prevent expensive check engine light repairs.

There are many other causes for check engine lights, and each one has their own set of warnings that need to be addressed to prevent costly repairs. Most of these warning signs are simple to spot, and if repaired, will save money and time. Some of the warning signs can be as simple as a low oil level, or dirty fuel filter.

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