The check engine light on a Ford F-250 comes on when your truck needs regular maintenance or when there is a problem with the truck. The on-board diagnostic computer, or OBD computer, throws an error code that i
hellow julius i recently replaced the battery in my car and no check engine light was on and then the check light came on so i hooked a scanner and all monitors were incomplete after driving the car the monitors are now ready except one the evap so as far as you know will the check ...