This light means your car’s onboard computer system (OBD1 or OBD2) has detected a problem with the engine, transmission, or emission system. It could be something simple like a loose gas cap (check this first!), or it could indicate a more significant issue like a failing oxygen sensor, catalytic converter, spark plugs/wires, or mass airflow sensor. If your check engine light stays on, that usually means to get it checked soon, and if your check engine light is flashing – that indicates a serious problem that requires immediate attention to prevent further damage. At J&Z, we will use a computer to diagnose the issue and provide you all the insight from the computer as well as how much it costs to fix.