When the check engine light comes on while driving, does panic set in? Is it a minor issue, or could it spell trouble for your vehicle? Should you opt for a free scan or invest in a professional diagnosis?
For a video on what the various vehicle warning lights mean, skip to the bottom of this page.
What is The Check Engine Light For
The check engine light serves as your vehicle's early warning system, indicating potential issues with the engine, transmission, or emissions system. When it illuminates, your car's onboard computer has detected a problem, prompting a diagnostic trouble code (DTC) to be stored in its memory. While the light itself doesn't pinpoint the exact issue, it signals the need for further investigation.
The Risks of Ignoring the Check Engine Light
Ignoring the check engine light might be tempting, but it can result in more severe and expensive issues in the future. A minor issue that is ignored could turn into a significant problem, causing you more trouble if left unattended. Also, even if the issue is minor, leaving the light on can prevent you from being alerted to a second problem in the future.
Common Causes of the Check Engine Light:
There are a multitude of issues that can trigger the check engine light. Some of the most common include:
Faulty Oxygen Sensor
The oxygen sensors monitor the amount of unburned oxygen in the exhaust system and helps regulate the fuel mixture. A faulty sensor can cause the engine to run at a sub-optimal air-fuel ratio, decreasing performance and fuel economy as well as increasing emissions.
Fuel Vapor Leak
A loose or damaged gas cap or other vapor leak can cause fuel to evaporate from the tank, the evaporative emissions system is designed to prevent fuel vapors form escaping. If this system has a leak, it will trigger the check engine light.
Catalytic Converter Issues
The catalytic converter helps reduce emissions by converting harmful gasses into less harmful ones. A failing catalytic converter can lead to decreased performance and increased emissions.
Mass Airflow Sensor Problems
The mass airflow sensor measures the air entering the engine and helps regulate fuel injection. A faulty sensor can lead to poor performance and decreased fuel economy.
Spark Plug or Ignition Coil Issues
Spark plugs and ignition coils ignite the air/fuel mixture in the engine. Worn or faulty components can lead to misfires and decreased performance.
Getting a Free Scan and Professional Diagnosis:
Now that you know some common causes of the check engine light, it's time to get it diagnosed. At Airpark Auto Pros offer free check engine light scans using diagnostic tools that plug into your car's onboard computer. These scans can provide valuable information about what further diagnosis is needed.
It's vital to acknowledge that the scan only provides initial information about the issue, and it's just the beginning of the diagnostic process. The code tells us what area of the system is malfunctioning such as the engine/powertrian control module (ECM/PCM) seeing unexpected or out of range signals from one of it's sensors. However, further diagnosis is typically required to determine why that signal is out of range; is the sensor faulty? Is there a solenoid or actuator that is not functioning properly? Is there another mechanical issue? Many DTCs have several possible causes so professional expertise and experience are crucial in diagnosing and resolving the problem.
Most Common Questions Customers Have
"Why does my check engine light turn on and off at times?"
Intermittent check engine light issues may stem from loose wiring, damaged wiring, or temporary sensor malfunctions. A diagnostic scan can identify the precise cause.
Is it safe to drive with the check engine light on?
While short-distance driving with the check engine light on might be safe, prolonged driving with unresolved issues can cause further damage and increase repair costs. It can also mask a new, more urgent issue in the future.
Can I reset the check engine light myself?
Yes, you can reset the check engine light using a diagnostic tool or by disconnecting the car's battery. However, the light will likely reappear unless you address the underlying issue. Prioritize diagnosing and fixing the problem.
What do all the car dashboard warning lights mean?
Don't gamble with your vehicle's health. Let Airpark Auto Pros skilled technicians decode your check engine light's message, determine the right diagnostic procedure, and ensure your car runs smoothly.