KIA Sportage OBD2 Problem

Hi all
KIA Sportage 2009, 4 cylinder engine, when I connect my (OBD2 Scan tool) the device connect to the car properly and informing me that OBD Vehicle unit was located and connected, but I receive result of (no error codes ... or OBDII did not find any retrived codes) aulthough the car have many serious problems such as (engin nocks, bad nois during driving and I cannot drive more than 90 km/h velocity, I need your help or any one advice me why I didnot receive any (check engin kight) and why (I didnot find any error code) ... what I shoul do in this case.
regards
Konet

Hi all
KIA Sportage 2009, 4 cylinder engine, when I connect my (OBD2 Scan tool) the device connect to the car properly and informing me that OBD Vehicle unit was located and connected, but I receive result of (no error codes ... or OBDII did not find any retrived codes) aulthough the car have many serious problems such as (engin nocks, bad nois during driving and I cannot drive more than 90 km/h velocity, I need your help or any one advice me why I didnot receive any (check engin kight) and why (I didnot find any error code) ... what I shoul do in this case.
regards
Konet

Many OBD2 scanners will not work on new vehicles without a CAN-BUS communication adaptor.

OBD II is an engine operating system, and primarilly monitors sensors relavent to fuel management and emissions control. It is not an all comprehensive diagnostic system. Soon-to-come OBD III will be considerably more comprehensive. To have an operational problem that has not set a code means that the problem is not within the monitored domain of the OBD system. It means "resort to manual checks". Begin with the basics of fuel quality, clean fuel filter, no water in fuel, and work through fundamental visual inspection of air inlet systems, throttle cables, and so-on.