Diesel Mechanic
Posted Sep 14, 2026 · We last checked this listing on Oct 6, 2026
Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
How do you document a repair on a work order so the next person understands what was done?
What they are checking: Whether they write clear records, which matter for safety, warranty and DOT compliance.
Tell me about a time you learned to fix something new.
What they are checking: Whether they keep learning as truck systems and electronics change.
What would you do
You find a safety issue that wasn't on the work order, but the driver needs to leave. What do you do?
What they are checking: Whether they put safety first and communicate with the shop lead rather than letting an unsafe truck go.
A driver is frustrated that their truck is taking too long. How do you handle it?
What they are checking: Whether they can give honest updates and treat drivers as customers, which the posting mentions.
About the work
A tractor comes in with a check engine light and low power. Walk me through your diagnosis.
What they are checking: Whether they use diagnostic tools and a logical process instead of replacing parts until the problem goes away.
How do you troubleshoot an air brake system that's losing pressure?
What they are checking: Whether they know the air system, from compressor and governor to drier and valves, and can find leaks safely.
Tell me about the hardest electrical problem you've fixed on a truck.
What they are checking: Whether they can use a volt-ohm meter and wiring diagrams to track down real electrical faults.
What's in your toolbox right now?
What they are checking: Whether they own the advanced hand tools, impact and meter the posting requires and have real shop experience.
Walk me through a preventive maintenance inspection on a tractor.
What they are checking: Whether they know what a thorough PM covers and why it prevents breakdowns on the road.
How comfortable are you driving a tractor in and around the shop yard?
What they are checking: Whether they can safely move equipment, which is part of the job.
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Practice this out loudThe full job description
As published by Werner Enterprises.