ALLDATA is an online factory diagnostic and repair manual resource used by repair garages nationwide. When my dad was a mechanic, he used ALLDATA every day - he said it's a lot easier than dealing with paper factory service manuals and it has a LOT more information than a Chilton's or Haynes manual.
ALLDATAdiy.com is the version of that for people who work on their own cars. Still the same data used by the pros, but you pay per vehicle instead of a large monthly fee to access any vehicle.
Normal fees for a 1 year subscription is: $26.95 for the first car, $16.95 for each additional.
Normal fees for a 5 year subscription is: $44.95 for the first car, $29.95 for each additional.
With promo code RENEWDIY, you can get 1 year for $9.95 or 2 years for $12.95. This promo code applies to both the first car and additional cars.
This promotion is good through January 30th.
I just used this code to sign up for it for Project $300, my '00 Pontiac Grand Am SE. With the electrical gremlins it has, I'm going to need it.