Q:

What causes the check engine light to come on?

A:

Quick Answer

The check engine light may come on for various reasons including if the gas cap is loose, oxygen sensor needs replacing, spark plugs need replacing and catalytic converter has a problem. It is a good idea to check the engine when this light comes on because it usually indicates a problem of some sort.

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Full Answer

When the check engine light comes on, it is prudent to heed the warning and have the vehicle examined. Taking it to a mechanic may help solve the issue much faster. However, sometimes just checking a few things in the engine may help resolve the problem.

One of the things to check when this light comes on is the mass airflow sensor. This device usually measures the amount of air going through the engine and helps determine the appropriate amount of fuel needed for efficiency.

Spark plugs and plug wires may equally be the problem. They are responsible for igniting oxygen and fuel within the combustion chamber. Failure to correct any problem with these devices may lead to poor performance of the vehicle.

The next thing to check is the gas cap, which is responsible for keeping the tank tightly sealed and controlling the pressure within. Failure to correctly tighten the cap may lead to fuel loss through spilling and evaporation.

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