Argos blurb says:-
# Find out what is really wrong with your car before taking it to the garage.
# Check for faults on second hand cars before buying.
# 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.
# Compatible with all petrol engine cars manufactured since 2001 and all diesel engine cars manufactured since 2004.
# Read/reset fault codes.
# Reset 'check engine' light.
# Backlit display.
# Compatible with the latest CAN protocol.
# Includes CAN OBDII code reader, CD with code definitions and carry case.
# Size (H)11, (W)7.5, (D)2.2cm