Originally Posted by jdstrickland

Good info, but not always true. Just sayin....

EVERYONE with a 1996 or later automobile MUST have an OBD II Code Reader. You can buy an ELM-327 module on eBay or Amazon for $20-ish depending upon extra features (connectivity) you choose, then get any of several different apps for your phone or tablet. Apps come in a Free Version that has limited capability -- unable to create graphs or charts, that sort of thing -- and Fee Based versions with full capabilities. All versions report OBD II Codes and provide text translations, the fee versions will collect data over time and provide a means to download into a spread sheet so you can build graphs and charts.