My only guess is that the engine needs servicing. In most cases it will not. Its most likely to be an electronics fault that there is an orange engine displayed. Still i suggest you take it to get fixed.
No, the check engine light does not come on because your gas is half way full. The check engine light will come on if there is a problem with the engine.
Engine
needs engine oil ...
It means you need to check your engine
No the check engine light will not come on
Problem with engine electric
The orange engine light means that your Saturn LS300 has a sensor that is signaling for a service. This could be an oxygen sensor, an oil sensor, or even a tire sensor.
If an check engine light does not come on it is a good thing. When your check engine light comes on, it means you need service done on your vehicle.
If it has a downstream O2 sensor the check engine light will come on but if it does not the light may not come out. In most instances it will set the check engine light.
No, the check engine light has nothing to do with the oil level in the vehicle. The check engine light will come on when there is a problem with the emission system. The red oil warning light will come on if your vehicle is low on oil.
Orange, then light blue, then in 89, black.