Modern cars have a built-in diagnostic system called OBDII or EOBD which your garage will plug into to help determine any faults. You can now plug into this system yourself.This product will analyse faults identified in the car management system. Find out what is really wrong with your car before taking it to the garage. Check for faults on second hand cars before buying. Compatible with all petrol engine cars manufactured since 2001 and all diesel engine cars manufactured since 2004. Read and reset fault codes. Reset 'check' engine light. Displays fault code explanations on screen Backlit display Additional freeze-frame information and test results storage function for Off-car analysis. Includes scan tool, user manual, software CD, OBDII cable, serial cable, carry case and 9V battery. Size (H) 20, (W) 8.5, (D) 3.5cm. The scanner will not cure any faults identified. This must be done by a mechanic.