Car Repair: Check Engine Light
Introduction
The check engine light (CEL) is a dashboard indicator that illuminates when the engine control module (ECM) detects a problem with the engine or emissions system. The CEL is designed to alert the driver to a potential problem that could lead to decreased engine performance, increased emissions, or even engine damage.
Common Causes of the Check Engine Light
There are many different problems that can cause the check engine light to illuminate. Some of the most common causes include:
- Oxygen sensor failure
- Mass airflow sensor failure
- Spark plug or ignition coil failure
- Fuel injector failure
- Exhaust gas recirculation (EGR) valve failure
- Catalytic converter failure
- Vacuum leak
- Electrical problem
Symptoms of the Check Engine Light
In addition to the illuminated check engine light, there may be other symptoms that accompany the problem. These symptoms can vary depending on the cause of the problem. Some common symptoms include:
- Decreased engine performance
- Increased fuel consumption
- Rough idle
- Stalling
- Hesitation or surging
- Backfiring
- Knocking or pinging
What to Do When the Check Engine Light Illuminates
If the check engine light illuminates, it is important to have the problem diagnosed as soon as possible. Driving with the check engine light illuminated can lead to further damage to the engine or emissions system. To diagnose the problem, a mechanic will use a diagnostic scanner to read the trouble codes stored in the ECM. The trouble codes will indicate the specific problem that is causing the check engine light to illuminate.
Once the problem has been diagnosed, the mechanic will recommend the necessary repairs. The cost of the repairs will vary depending on the cause of the problem. In some cases, the repairs may be simple and inexpensive. In other cases, the repairs may be more complex and expensive.
Preventing the Check Engine Light from Illuminating
There are a few things you can do to help prevent the check engine light from illuminating. These include:
- Regularly maintain your vehicle according to the manufacturer’s recommended maintenance schedule.
- Use high-quality fuel.
- Avoid driving in extreme conditions.
- Have your vehicle inspected by a mechanic if you notice any changes in engine performance.
Conclusion
The check engine light is a valuable tool that can help you identify and fix problems with your vehicle’s engine or emissions system. If the check engine light illuminates, it is important to have the problem diagnosed as soon as possible. By taking these simple steps, you can help prevent the check engine light from illuminating and keep your vehicle running smoothly.
