Greetings all,

 OK, so the '97 is only new to me/us, just purchased this weekend for our
daughter.  The subject is a '97 Explorer Eddie Bauer edition, 5.0 engine,
AWD.
 Main question,  after finding and fixing a bad #7 plug wire, how can I
reset the "Check Engine" light?  Have been told that only a factory tool
will do so and that it must go through a "drive cycle" approx. 200 miles.
 Secondary questions, the vehicle has a few other minor problems,
unfortunately they mostly seem to be electrical.  In no particular order;
Driver side door lock control will lock but not unlock the doors;  Passenger
side headlight will not work on low beams, works on high, put new bulb in,
same problem.  Is it "normal" for the AWD to hear a "decelerating roar" when
decelerating?  Roar may be a bit strong of a word, but not sure what else to
call it.

 I realize that the first 2 problems will probably require an electrical
diagram and a meter, just thought someone might be able to give me a
starting point based on previous history.

 Thank you in advance for your patience and any and all replies,
 Jim C Roberts