Common Check Engine Light Causes and What to Do

Introduction

That glowing orange light on your dashboard is often feared by drivers, but it's actually your car's way of preventing major damage. Here is what's usually wrong.

Top 5 Causes

• Loose Gas Cap: The #1 culprit. It breaks the vacuum seal in the fuel system.
• Faulty Oxygen (O2) Sensor: Causes poor gas mileage and emissions failure.
• Catalytic Converter: A more expensive part that fails due to engine neglect.
• Mass Air Flow Sensor: Tells the car how much air is coming in.
• Spark Plugs: Worn out plugs cause engine misfires.

The Fix

Use an OBDII scanner (available for $20 online) to read the specific code (e.g., P0420). Once you have the code, you know exactly what to replace.

Costs

Gas cap: $15. O2 Sensor: $100-$300. Catalytic Converter: $800-$2,500.

Conclusion

Don't ignore the light. Small fixes today prevent engine replacement tomorrow.