I tryed to check my engine light the other day by using the method in one of the posts, and when i go to turn the screw, there is no stopping point. I can just continue to turn it, therefor i cannot check what the code is. What could it be?

 

Did you round off the plastic and your screw drive is just turning? take a look. It should stop.

 

what do you mean? i put in a screw driver and turn the screw but it wont stop, i can just keep turning it.