at times l will start it up to warm up the car, and 15 min the light will come on.

no the engine light shouldnt come on just because of the outside temp unless it has some problem that goes away when the car is warmed up

No, your light came on most likely because of a faulty sensor. The cam sensors are known to go bad on your particular model. There are 2 sensors under there which are easy to replace. l think its like $150 each, so the trick it to find which one is causing the fault code.