Check Engine Light: What It Means and How to Fix It
Check Engine Light: A Driver’s Guide
The check engine light is telling you something is up. It could be as simple as a loose gas cap or as serious as a failing engine part. If you ignore it you’ll be looking at costly repairs, poor fuel economy, or engine failure.
When the light comes on your car’s onboard diagnostics (OBD-II) has detected a problem. Knowing what this means and how to respond will save you money and keep your vehicle running smoothly.
Check Engine Light Colors
The colour and behaviour of the check engine light tell you the severity of the problem:
| Light Type | What It Means | What You Should Do |
|---|---|---|
| Solid Yellow/Orange | Minor issues, such as a loose gas cap or minor emissions issue | Schedule a visit to your mechanic soon. |
| Solid Red | A major issue requiring immediate attention | Stop driving and have the vehicle inspected immediately. |
| Flashing Light | Critical problems, such as an engine misfire | Pull over and seek urgent professional help to avoid engine damage. |
If the light is flashing or red, stop driving. You could be looking at serious damage or safety issues.
Check Engine Light Causes
Many things can trigger the check engine light. Here are the most common:
1. Loose or Broken Gas Cap
A loose or broken gas cap allows fuel vapours to escape and disrupt the emissions system. Just tighten or replace the cap and you’re good to go.
2. Faulty Oxygen Sensors
These sensors monitor the air-fuel mixture in your car. When they fail you’ll get poor fuel economy and higher emissions.
3. Worn Spark Plugs or Ignition Coils
Worn spark plugs or ignition coils can cause engine misfires, damaging the catalytic converter if not fixed.
4. Faulty Catalytic Converter
A failing catalytic converter increases emissions and reduces fuel economy and overall performance.
5. Dirty or Low-Quality Fuel
Low-quality fuel can cause performance issues and trigger the check engine light.
6. Mass Airflow (MAF) Sensor Problems
The MAF sensor helps your engine maintain the correct air-fuel ratio. When it fails the car will hesitate, idle poorly, or consume more fuel.
7. Other
EGR valve, vacuum leaks, overheating, or low oil pressure can also trigger the light.
Fix these issues quickly and your car will keep running smoothly and avoid bigger and more costly repairs.
DIY Before You Go to the Mechanic
Before you head to the repair shop try these simple fixes first:
1. Tighten the Gas Cap
Check your gas cap is secure. If it’s old or damaged replace it.
2. Check the Fuel
Bad fuel? Run the tank down and fill up with high-quality fuel to flush out the contaminants.
3. Quick Visual Check
Look under the bonnet for loose wires, disconnected hoses, or damaged components.
If these don’t fix the issue use an OBD-II scanner or consult a mechanic for further diagnosis.
Serious Problems Behind the Warning Light
Some check engine light causes are minor but others are major and need attention ASAP:
Engine Misfires: Misfires can damage the catalytic converter and reduce engine efficiency.
Overheating: This can cause internal damage and needs to be fixed ASAP.
Low Oil Pressure: Low oil pressure can cause wear or even engine failure.
Emissions System Failures: Problems with oxygen sensors, catalytic converters or EGR valves can harm the environment and performance.
In these cases, there’s no time to waste. Fixing the issue quickly will save you money and your vehicle’s life.
Why Ignoring the Check Engine Light Is Expensive
Waiting when the check engine light comes on can have big consequences:
Higher Repair Bills: Minor issues left unfixed become bigger and more expensive.
Poor Fuel Economy: Faulty systems can reduce gas mileage.
Failed Emissions Tests: A faulty emissions system will prevent you from driving your car legally.
Engine Damage: Overheating or misfires can cause permanent engine damage.
Fix it quickly and save money and your car will run smoothly and safely.
