Check Engine Light On? Here's What It Could Mean
Few things cause more anxiety for drivers than seeing the check engine light turn on. The good news: it doesn't always mean a major repair. Here's a guide to what it could mean and how to respond.
Common Causes of a Check Engine Light
- Loose or faulty gas cap: One of the most common — and cheapest — causes.
- Oxygen sensor issues: A failing O2 sensor can reduce fuel efficiency and increase emissions.
- Catalytic converter problems: Often triggered by an underlying issue that went unaddressed.
- Mass airflow sensor failure: Affects how your engine measures and mixes air and fuel.
- Spark plug or ignition coil issues: Can cause misfires, rough idling, or reduced power.
Steady Light vs. Flashing Light
A steady check engine light usually means a non-emergency issue that should still be checked soon. A flashing check engine light indicates a more serious problem, such as a misfire that could damage your catalytic converter — in this case, reduce speed and have your vehicle inspected as soon as possible.
Should You Keep Driving?
If the light is steady and your car is running normally, it's usually safe to drive to a repair shop within a few days. If you notice poor performance, strange smells, unusual noises, or the light is flashing, it's best to get it looked at right away to avoid further damage.
Why Accurate Diagnostics Matter
A diagnostic scan provides a trouble code, but experienced technicians are needed to interpret what that code actually means for your specific vehicle. That's why we combine diagnostic tools with hands-on inspection to give you an accurate answer — and an honest repair recommendation.
Don't ignore that warning light. Schedule a diagnostic check with Hassan's Auto Repair, proudly serving Lowell, Chelmsford, Dracut, Tewksbury, and Billerica, MA.