Freightliner Trucks / Daimler Trucks North America

I purchased a 2017 Freightliner from Dogget Freightliner in San Antonio Texas. The truck is my sole source of income. It is still under warranty until June. Shortly after purchase exhaust fumes started coming into the truck and smoke was visible coming from underneath the truck. It has been into the shop at Dogget 4 times to fix the problem. The fumes are dangerous but I cannot afford to continue to take it their shop. I have lost $10, 000 plus in salary and they have charged me approximately $4, 000.00. They keep charging me for their plug and play solutions which has done nothing to fix the truck. They said they have went back to Freightliner for a solution mean while I must drive this truck to make a living. Need assistance to solve this problem or I am going to lawyer up.