Technician-owned diesel ecommerce
Serious diesel tools, selected by a technician.
High-end diagnostic equipment and specialty performance parts for diesel technicians and service managers—curated through 20 years of hands-on shop experience.
Built for people who diagnose the fault, write the estimate, and stand behind the repair.
What to expect
Shop standards, not marketplace noise.
20 years applied
Products are considered through the lens of real diagnostic work, uptime pressure, and shop economics.
Focused catalog
A deliberate range of premium diesel equipment and parts instead of an indiscriminate warehouse catalog.
Straight answers
Clear product details and practical guidance for technicians and managers making consequential purchases.
The working catalog
Equipment for the bay. Parts for the build.
Start with the job in front of you. Holman Diesel & Diagnostics concentrates on three areas where quality and fitment matter most.
Browse the full catalog- 01
Advanced diesel diagnostics
Professional scan tools, interfaces, test equipment, and accessories selected for demanding troubleshooting—not casual code reading.
Find diagnostic equipment - 02
Engine specialty parts
Purpose-specific components for diesel service and repair, with an emphasis on dependable construction and clear application.
Shop specialty parts - 03
Performance hardware
High-quality performance parts for customers pursuing stronger, more capable diesel builds without treating component choice as guesswork.
Explore performance parts
Selected inventory
Start with shop-ready picks.
For technicians who know the difference
Put experienced selection behind your next order.
Explore professional diesel diagnostics, specialty engine components, and performance hardware chosen with real shop work in mind.