If you’re planning on doing any serious maintenance or work on your post-1996 vehicle, you’ll eventually want to own a quality code scanner, like this one which we own and found for $135 right now on Amazon.
This device plugs into your car’s computer and translates the codes in the system into English (or Spanish) and also allows you access to other data stored in the system. That data varies from car to car, but can be quite helpful in diagnosing problems — or at least for telling you why the damn “check engine” light is on yet again.
Anyway, we’ve had good luck with this particular unit, and $135 is a pretty good price for it.
Equus 3110 Innova Diagnostic Code Scanner Via Amazon [What’s this?]
Street Pricing [Google Products]