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. Includes CD with code definitions and carry case. Size (H)11, (W)7.5, (D) 2.2cm. The Fault Code Reader will not cure any faults identified. This must be done by a mechanic.