A check engine light means the engine computer stored a fault code. It does not tell you how serious the problem is by itself — the pattern of the light and how the car behaves matter more.
Steady light vs. flashing light
A steady light usually means you can keep driving carefully and get it checked soon. A flashing light generally signals a misfire that can damage the catalytic converter — reduce speed, avoid heavy acceleration, and get the vehicle looked at right away. If the car is shaking, losing power, overheating, or smells of fuel, stop driving it.
Two things worth checking yourself
First, the gas cap: a loose or cracked cap sets an evaporative-emissions code on many vehicles. Tighten it and see whether the light clears after a few drives. Second, look at your fluid levels and listen for new noises — information you noticed is information we can use.
Why a code is not a diagnosis
A parts-store scan gives a code, not a cause. An oxygen-sensor code can come from a bad sensor, a vacuum leak, an exhaust leak, or a fuel-trim problem. We read live sensor data and test the circuit before recommending a part, so you are not paying for guesses.
Maryland inspections
An active check engine light causes problems for emissions testing, so it is worth resolving rather than ignoring. Call us at (410) 979-5236 and we will tell you what a diagnostic involves for your vehicle.