Dash is an app that lets your monitor your car in real-time by reading ODB2 Fault Codes and performance sensors (e.g. speed, RPM, coolant temperature, intake air temperature, fuel levels). The app provides quick access to the key data and a number of attractive visuals (e.g. for speed and temperature).

In order to use the app you will need to plug-in a Bluetooth adapter in to the OBD socket in your car (e.g. this Wireless Bluetooth Diagnostic Scanner from Amazon). Dash will work with any vehicle that supports the OBD II standard (most cars built after 2000). If you are in doubt, look under the hood and try to locate a white label that explicitly states that the vehicle is designed to comply with the OBD-II legislation.

OBD (on-board diagnostics) is an automotive term referring to a vehicle's self-diagnostic and reporting capability. OBD2 implementations use a standardized digital communications port to provide real-time data in addition to a standardized series of diagnostic trouble codes, allowing you to identify and, potentially, fix problems.

Windows Phone Store description:

With Dash you can monitor your car in realtime. Read OBD2 fault codes, car performance sensors etc. Dash uses a OBD II Bluetooth adapter to connect the ECU in your car. Dash is a plug and play app, plug in the Bluetooth adapter in the diagnostics socket in your car and you are ready to go.

Dash can download from the Windows Phone Store. The app costs £4.99 / $5.99 / €5.99.

There are a number of alternative apps in the Windows Phone Store that do much the same thing (e.g. Engine Link and Dex). There are also a number of OBD Fault Code look up apps (e.g. OBD2 Codes and OBD-II Trouble Code Lookup).