When your car's "Check Engine" light comes on it is always a sign that something is wrong.  “engine light” could mean a costly problem or it could be something minor, like a loose gas cap. You then know immediately that this is a sign that you need to go to the mechanic shop to have the car tested.  The service technicians will put the car through the diagnostics test to diagnose the problem.
As believers, we can get out of tune with God; and deep down we begin to sense the inward turmoil’s , the spiritual distress , the disturbance, these signs sometimes will indicates that we are vulnerable to satan’s assault on our souls. 
We then need to be tested by the word of God and the spiritual diagnosis applied to solve our problems immediately.