CARS & GETTING AROUND

What Should I Do When the Check Engine Light Comes On?

A simple way to think through a check engine light and the next useful step.

First: steady or flashing?

A steady light usually means the vehicle computer stored a fault that should be diagnosed. A flashing light can indicate a more urgent problem and is a reason to reduce driving and get the vehicle checked promptly.

Useful first checks

• Notice rough running, loss of power, smoke, smell, or overheating.
• Make sure the fuel cap is properly tightened if your vehicle uses one.
• Have the diagnostic trouble code read instead of replacing parts based only on the light.

The code is a clue, not automatically the name of the failed part.

Breslee gives general informational help. Important medical, veterinary, legal, financial, or safety decisions may require a qualified professional.