When your check engine light comes on, it can be concerning, but it’s important to stay calm and address the issue methodically. Here’s what you should do:
1. Check for Immediate Issues
Ensure safety first: If the car is driving normally and no other warning lights are on, it’s likely not an emergency.
Check dashboard lights: Look for additional indicators like low oil pressure or overheating.
If the car feels rough, makes unusual noises, or behaves erratically, pull over safely and turn off the engine.
2. Tighten the Gas Cap
A loose or damaged gas cap is a common cause of the check engine light.
Tighten it properly until it clicks. The light might not turn off immediately but should reset after a few drives.
3. Check for Obvious Problems
Inspect for visible issues like:
Low fluids (oil, coolant, etc.).
Loose connections in the engine bay (if you’re comfortable).
Signs of leaks or damage.
4. Use an OBD-II Scanner
Many auto parts stores (like AutoZone or Advance Auto Parts) offer free OBD-II scanning services.
You can also purchase an affordable scanner or use a Bluetooth OBD-II adapter with a smartphone app.
The scanner will provide a diagnostic trouble code (DTC) that explains the issue.
5. Interpret the Code
Research the DTC online or refer to your vehicle’s manual.
Some codes indicate minor issues (e.g., an O2 sensor needing replacement), while others signal critical problems (e.g., catalytic converter failure).
6. Decide on Action
Minor issues: For less critical problems, plan a repair or maintenance appointment.
Major issues: If the code suggests a severe problem or if the engine feels strange, avoid driving the vehicle and contact a mechanic.