Reasons Why My Check Engine Light Came On and Won’t Turn Off

The reason why your automobile’s check engine light has come on is that there is a problem. Studies show that this light is very accurate in detecting issues in the engine that might go unnoticed otherwise. Automobile Diagnostics can run a diagnostic check to find out why your check engine warning has come on. This test will point us in the correct direction so we can fix the problem.

Bad Catalytic Converter

A common reason why a check engine warning comes on is the catalytic converter has gone bad. This crucial exhaust system part converts poisonous gases into safe gases before they are pushed through the tailpipe. The catalytic converter can get clogged and, after about 90,000 miles, might need to be replaced.

Electrical Issue

The engine control unit turns on the check engine light. If this main computer chip is experiencing an issue, or if any of the system sensors throughout your automobile are having problems, the check engine light will turn on. You may also have another problem in the electrical system.

Exhaust Leak

If you have an exhaust or vacuum leak, there may be too much air in your engine and this will create problems with the air and fuel mixture. As a result, you may not only experience engine performance issues but also get a check engine light warning from the engine control unit.

Loose Gas Cap

If your check engine light turns on as you’re leaving the gas station, it’s possible that you did not screw on your gas cap tightly after you’ve filled your car, truck, or utility vehicle. Park in a safe space and make sure the gas cap is on tight. If it isn’t, this may be why the check engine light came on.

Mass Airflow (MAF) Sensor Failure

The MAF sensor measures how much air flows into the engine from the outside. If the sensor is failing, the engine control unit may make adjustments to the air and fuel mixture that trigger a check engine warning because the mixture is off. Replacing or cleaning the MAF sensor usually solves the problem.

Oxygen Sensor (O2) Sensor Failure

The oxygen sensor measures the O2 levels in your vehicle’s exhaust. It is located at the beginning of the tailpipe and it, too, sends information to the engine control unit so it knows whether it needs to make adjustments to air and fuel mixtures. A failing O2 sensor is a common reason why check engine lights come on.

Spark Plug Misfiring

If your spark plugs are not firing correctly, it could be because they or worn or because there is a problem with the engine control unit. Misfiring spark plugs cause problems with engine detonation, and you will have a sputtering or stalling engine alongside the check engine light warning.

Transmission Problems

Finally, transmission problems can often cause the check engine light to come on because the transmission has no other way to let you know that it is going bad. Aside from the dashboard warning, you may also notice your vehicle is having problems shifting gears.

Call or stop by Automobile Diagnostics in Columbus, IN, for a diagnostic test to find out why your check engine light has come on. Once we know the problem, we’ll fix it.


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