Diesel Mechanic Job Description: Top Duties and Qualifications. ... Their main duties include running diagnostic tests on vehicles, replacing the vehicles' engine, transmission, steering mechanism or braking system and test driving the vehicle to determine if they properly fixed the maintenance issue.

Service technicians, also referred to as field service technicians, are responsible for providing different services, depending on their area of expertise, and diagnosing problems and making repairs. 

Office managers essentially ensure the smooth running of an office on a day-to-day basis and may manage a team of administrative or support staff, managing office budgets. liaising with staff, suppliers and clients. implementing and maintaining procedures/office administrative systems.

You're responsible for inspecting, preparing, and presenting a vehicle along with arranging for a test drive once the customer is interested. In addition to providing advice and answering sales and product-related questions, bargaining over the final price is also typical to the car sales process