What Does Check Engine Mean on a Car?
Overview
The check engine light is a warning light that illuminates on the dashboard of a car when the engine control module (ECM) detects a problem with the engine or emissions system. The ECM is a computer that monitors the car’s engine and emissions systems and makes adjustments to ensure that the engine is running properly and that emissions are within acceptable limits.
When the ECM detects a problem, it will store a diagnostic trouble code (DTC) in its memory. The DTC is a code that identifies the specific problem that has been detected. The check engine light will illuminate to alert the driver that a problem has been detected and that the car should be serviced as soon as possible.
Causes of the Check Engine Light
There are many different things that can cause the check engine light to illuminate. Some of the most common causes include:
- Loose or faulty gas cap
- Faulty oxygen sensor
- Faulty spark plugs or wires
- Faulty catalytic converter
- Faulty mass airflow sensor
- Faulty EGR valve
- Vacuum leak
- Engine misfire
What to Do When the Check Engine Light Illuminates
If the check engine light illuminates on your car, it is important to have the car serviced as soon as possible. Driving with a check engine light can damage the engine and emissions system, and it can also lead to increased fuel consumption. Having the car serviced will allow the mechanic to diagnose the problem and make the necessary repairs.
There are a few things you can do to help the mechanic diagnose the problem:
- Write down the mileage when the check engine light illuminated.
- Note any symptoms that you have noticed, such as rough idling, poor acceleration, or increased fuel consumption.
- Bring any previous service records or repair bills to the mechanic.
Conclusion
The check engine light is a warning light that should not be ignored. If the check engine light illuminates on your car, it is important to have the car serviced as soon as possible to prevent further damage and to ensure that the car is running properly.
