Check Engine Light Diagnostics in Chantilly, VA

If the light is steady and the car drives normally, it is usually fine to drive a short distance, but have it checked soon. If the light is flashing, the engine is likely misfiring. Slow down and avoid driving further than necessary, because a severe misfire can overheat and damage the catalytic converter.

Yes. A loose or worn gas cap can set an evaporative emissions code. If tightening the cap does not turn the light off after several drives, have the system tested, since the same code can come from a leaking hose or a faulty valve.

No. In Northern Virginia, a vehicle with the check engine light on fails the emissions inspection. Clearing the code without fixing the problem does not help either, because the car has to finish its own self-tests before it can pass. The fault needs to be repaired so the light stays off.