OBD scanner paid for itself

Well, the OBD II Scanner I bought just paid for itself. I had to use it
for the second time on the blue Jeep. I got the code and looked up the
possible causes on the Internet. One cause was a gas cap issue so I
unscrewed the gas cap and put it back on. A couple of days later, the
check engine light went out. :) If you figure at least $50 every time
you need to take it to the shop to have the code checked (at a minimum),
the $100 scanner has paid for itself.