Ses light is on code comes back as catalitic converter is problem, but just got it back from mecanic after having engine work done it is not miss fireing runs beautifuly no problems at all but cant have emissions test run cause ses light is on how do i fix this. 1999 suzuki vitara mannual transmission(stick)

The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light (or Service Engine Soon or small picture of an engine) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested