Your check engine light comes on when the car's computer detects a problem with the engine, emissions or related systems. Whether it's steady or flashing makes a big difference.
Solid check engine light
A steady light means the computer has stored a fault code. The problem isn't usually an emergency, but it shouldn't be ignored for long. Small problems can get more expensive, and some can hurt your gas mileage.
Common causes include:
- A loose or damaged gas cap
- A failing oxygen sensor
- Worn spark plugs or ignition coils
- A vacuum leak
- A sensor or wiring fault
If you just filled up, check that the gas cap clicks tight. The light may take a few drives to go off after you fix it.
Flashing check engine light
A flashing light usually means the engine is actively misfiring. Unburned fuel can get into the exhaust and overheat the catalytic converter, which is an expensive part to replace. Reduce your speed, avoid hard acceleration and get the car checked as soon as possible. If the car runs very rough, stop driving it.
Why a code alone isn't a diagnosis
Many auto parts stores will read your code for free, and that's a fine first step. But a code only points to a system or a symptom. For example, a misfire code doesn't tell you whether the plug, the coil, the injector or a wiring problem is the cause. Replacing parts based on the code alone often means paying for parts you didn't need.
How we diagnose it
We scan all the car's computer modules with a professional scan tool, look at live engine data, and test the parts involved. Then we explain what we found in plain English and give you a written quote. Our flat service call ($175 in Palm Beach County, $225 in North Broward) covers the trip to you and the full diagnostic.