
The
Garmin ecoRoute HD Vehicle Diagnostics Communicator
is a cable which plugs between some of the
Garmin nüvi GPS
units and a car's
On-Board Diagnostics (OBD) interface, turning the GPS screen into a car diagnostic system.
The
goLINK OBD-II is a similar cable to interface for an Apple iPhone or iTouch and the
OBDLink Bluetooth interfaces via Bluetooth. You can also build the
blueOBD Kit and interface it to an Android phone.
If you want a dedicated device there is the
Auterra DashDyno which has its own screen and can be fitted into the car dash board.
Linear Logic make a cheaper dash mounted unit, but without GPS.

If all you want to do is actually work out what is wrong with your car, rather than show off with a flashy display, there are simple low cost calculator like
OBD-II Code Readers
.
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