At Sierra Auto and Diesel Service, we provide comprehensive emissions testing and DOT annual inspections to ensure your vehicle meets safety and environmental standards. Our certified technicians are equipped to perform detailed inspections for heavy-duty, medium-duty, and standard vehicles, ensuring compliance with Department of Transportation (DOT) regulations. From emissions testing to full vehicle assessments, we check every aspect of your vehicle to help you pass inspection and stay road legal. Trust us for reliable, efficient service to keep your vehicle in compliance with DOT requirements and running clean and safe.