Re: 2002 E-150 check engine soon??
If the engine light disappears and returns every couple times you start the vehicle I can't see it being a big concern. As rtg mentioned, get the vehicle scanned for the engine code(s) and post'm here. Autozone should scan the vehicle at no charge.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!