Check engine light 93 toyota t-100?

If the check engine light is on in your 1993 Toyota T-100, it indicates that the vehicle's onboard diagnostic system has detected a problem. Common issues could include a loose gas cap, faulty oxygen sensors, or more serious engine problems. It's advisable to use an OBD-I scanner to retrieve the trouble codes, which will help identify the specific issue. Once diagnosed, you can address the problem or consult a mechanic for further assistance.