Today’s Groupon offers a Bluetooth car diagnostic tool with trip computer. (£1.99 for Delivery)

• Can connect to almost every car, van or light truck fitted with an OBD diagnostic port, standard since 2001
• Compatible with both Android and IOS smartphones
• Allows a user to view a car, van or truck’s diagnostic information in real time through the app
• Acts as a comprehensive on-board trip computer for every journey, giving information on mileage, fuel costs and consumption or average speed
• Capable of reading and resetting engine check light fault codes
• Fault code shows on screen for easy reference, helping to discover the source of the problem without the need for a mechanic