On Board Diagnostic Code Reference contains well over 14,000 OBD I & OBD II trouble codes covering 50 different models of automobiles. Most models contain OBD I codes and all models support generic OBD II codes. This app does not connect to Bluetooth codes readers but is a great companion for code readers that do not contain internal databases. If the code you are looking for is not contained within our database then you can try searching the internet with the built in button. The Pro version has no ads, improved email form for communication, improved internet search so you can search with either the code or the code definition, and will soon support ELM327 Bluetooth connection for code retrieval. To use this app just select your automobile model, then enter the code and Retrieve your readout information. If you have any issues you can contact us through the included option. This app is compatible with all tablets or phones and also features app to SD Card.