Can low gas cause a check engine LIGHT?

No, low gas will typically not cause a check engine light. The check engine light is usually triggered by a problem with the vehicle's emissions control system or engine, rather than by a low fuel level. However, if the fuel level is extremely low, it can cause the engine to run poorly, which could in turn trigger the check engine light. In this case, the light would likely be accompanied by other symptoms, such as engine hesitation or rough idling. If you see the check engine light come on, it is best to have the vehicle checked by a mechanic as soon as possible to determine the cause and have it repaired if necessary.