If the smell of the exhaust gas in the KIA Spectra show only in the parking lot, the most likely reason is the failure of the exhaust system and the penetration of the exhaust into the ventilation of the passenger compartment.
If the salon penetrates an unpleasant odour that is like the smell of hydrogen sulfide, through open windows, the problem is in the catalyst, and more precisely, in the fuel. Spectra is designed to use 92 petrol. The smell of hydrogen sulfide may appear in the 95-meter load of the additive.