Parts management is a critical function of any auto repair shop business. The only way to guarantee that you’re making a profit on the parts you sell on repair orders is by having an air-tight system for managing and tracking those parts from purchase to sale to reconciliation. The final step of making sure that each and every parts transaction is accounted for is probably the most important step—and the most misunderstood.
Some of the issues your auto repair shop will run into if you don’t carefully manage parts include:
Un-billed parts (forgetting to collect payment on parts)
Inconsistencies between your cost of goods sold and accounts payable
Inability to track and receive return credits
Inability to detect theft before it gets out of hand
Many of these issues can be avoided by using purchase orders to reconcile the parts you sell on repair orders.
But many auto repair shop business owners still wonder what some of the best practices are when it comes to parts management. How often should you be reconciling parts payments? Who should take on this task: you, your service advisors, or a dedicated parts manager? How do you make sure you’re getting the best value for the parts you buy and sell? How do you ensure that each and every part is being billed?
Let’s answer some of these questions, and unpack the best practices for parts management.
1. Should You Have a Dedicated Parts Manager?
Many smaller auto repair shops do not necessarily need a parts manager, especially if the service advisors and business owner have a solid process for shopping for parts, placing orders, applying markups, and reconciling parts bills with purchase orders.
But as your shop grows to service more than a dozen vehicles a day, you should definitely consider hiring a dedicated parts manager.
Having a specific person in charge of ordering parts, keeping track of inventory, receiving parts, and reconciling purchase orders will not only free up time for your service advisors to focus on providing excellent customer service, but also ensure that your part’s process stays consistent as your business grows.
A dedicated parts manager can focus solely on all things parts, building out a process that is efficient and replicable, giving your shop more room to scale.
2. How Often Should Your Shop Reconcile Parts Orders?
Taking the time to fill out a purchase order whenever you order a part for repairs should become a daily habit.
It’s true that filling out a purchase order adds a little bit of time to the process when you’re trying to get a customer’s vehicle repaired, but it’s better to take the time then and there, or at least at the end of each day, then letting it pile up for the end of the month.
If you wait until the end of the month to make sure each parts order and payment is accounted for, you could easily miss orders from weeks prior and find yourself stuck with an all-day task, which can really take a toll on your workflow for that day.
Additionally, if you wait too long to focus on managing your finances when it comes to parts, you could find yourself losing money on credits for parts that should have been returned.
3. How Can You Identify if a Part Did Not Have a Purchase Order?
Sometimes when you’re going through your accounting software at the end of the day, week, or month, you may notice a discrepancy between what you think you're making on parts, and what you’re actually making.
This is usually because there is a missing purchase order, or several missing purchase orders, in your accounting system.
By using a shop management system with a parts report, such as Tekmetric’s Parts Purchase Report, you can compare what’s reported in there with what’s reported in your financial software.
If you try to verify by vendor on each system, you’ll most likely find the discrepancy, and then you can work backwards, looking at the parts report for that vendor within your shop management system to find out what purchase orders may be missing in your accounting system.
4. How Do You Ensure that You're Getting the Best Value for the Parts You Buy?
Like anything you buy, it’s wise to shop around.
At the same time, your shop has to order parts in a timely manner so that you can get the car back to the customer as soon as possible.
With the Tekmetric Shop Management System, parts managers and service advisors can quickly look up and compare parts from multiple suppliers directly within the Tekmetric dashboard, without having to open up multiple tabs.
By using a shop management system like Tekmetric, your shop can save both time and money while finding the best deals for you and your customers.
5. How Do You Ensure That Each and Every Part is Being Billed?
The best way to ensure that no parts go un-billed is by having solid processes for both inventory management and adding parts to repair orders.
Doing a full inventory check at least once a week will help your shop identify any parts that are missing and have gone unbilled.
Of course, you want to be proactive and make sure those parts are getting billed before you notice they’re missing.
For this, it helps to train your service advisors to all be on the same page when it comes to how parts are included on repair orders, and that they have clear communication with the customers, the parts vendors, and the parts manager.
Tekmetric: Designed With Best Practices in Mind
Using a shop management system like Tekmetric that has a job dashboard with built-in reminders can go a long way towards ensuring that customers are being billed for parts before they leave with their vehicles.
Because the Tekmetric system integrates with leading parts suppliers, it’s easier than ever to find the best deals on parts for your customers.
Tekmetric’s Parts Purchase Reports are another safeguard for auto repair shops to have visibility into the parts moving through their shop.
This article was written with the guidance of automotive repair industry CPA Hunt Demarest of Paar, Melis, & Associates, P.C.
FAQ
similar articles
Whether you're just getting started in the world of auto mechanics or you're a seasoned professional looking to sharpen your skills, having the right books in your toolkit can make a world of difference.
In this guide, we’ve rounded up the best 10 books for anyone looking to master automotive repair—five books for beginners and five for professionals. Whether you're diving into DIY oil changes, understanding electrical systems, or prepping for ASE certification, these books can help you become the car mechanic others rely on.
Top 5 Mechanic Books for Beginners
1. Auto Repair For Dummies by Deanna Sclar
Deanna Sclar, a trusted name in car books, breaks down automotive repair in a clear, engaging way. Topics include basics like changing oil, identifying car parts, and performing simple diagnostics. Updated editions also include guidance on hybrid and electric vehicles.
This book is great for high school students, DIY car owners, and anyone who wants to enhance their car repair knowledge. It teaches vehicle maintenance fundamentals and gives you the confidence to handle everyday car repair tasks.
This book is available in paperback and audiobook format on Amazon and Goodreads.
2. How Cars Work by Tom Newton
“How Cars Work” is an illustrated mechanics book designed to make complex automotive technology digestible. It covers everything from internal combustion engines to carburetors using simple diagrams and descriptions.
Ideal for visual learners and those completely new to auto mechanics. This is a great first book for beginners, high school students, and anyone wanting a strong visual foundation. This book is available at Amazon, Goodreads, and Walmart.
3. Service Repair Manuals
Service repair manuals offer detailed, step-by-step instructions specific to various makes and models. Whether you're working on a Chevy or a lawn mower, there's likely a repair manual for it.
These manuals walk you through every procedure—from basic maintenance to full rebuilds—making them excellent for DIY mechanics. The manuals are great for car owners who want to perform their own maintenance and repairs, especially oil changes and part replacements.
4. Auto Repair and maintenance for Beginners by Dave Stribling
This is a more recent release that blends practical guidance with a conversational tone. It’s designed for car owners who want to understand what’s under the hood without going back to school.
It breaks down diagnostics, basic electrical systems, and essential car repair projects with clarity and confidence. DIYers, automotive technology students, and anyone just entering the field will benefit from this resource. This book is available on Amazon and Target.
5. ASE Study Material
While not a traditional repair resource, these ASE guides cover specific topics you may be interested in. In addition, these resources can also help you study for your ASE exams/certification. These study guides cover everything from refrigerant to engine diagnostics.
These resources are great for beginners looking to become ASE certified or just want to deepen their technical knowledge of car repair. You can find these ASE resources on the ASE website.
Top 5 Mechanic Books for Professionals
1. Automotive Technology: A Systems Approach by Jack Erjavec & Rob Thompson
Used in technical schools and ASE training programs, this comprehensive study guide covers every vehicle system in detail. From brakes to diagnostics and internal combustion engines, it’s a powerhouse of professional knowledge.
Excellent for instructors, professional auto mechanics, and shop technicians. It’s also used as a curriculum base in many accredited auto mechanic programs. This book can be found on Amazon and Goodreads.
2. Engine Repair (A1) – ASE Test Prep Study Guide by Delmar Cengage
If you’re serious about becoming ASE certified, this study guide is one of the best tools to prep with. It’s focused on the A1 Engine Repair certification exam and is updated with the latest questions and procedures.
It contains practice questions, answer keys, and step-by-step breakdowns of engine troubleshooting and repairs. Mechanics pursuing ASE certification and current techs looking to refresh their credentials will benefit from this book.
3. Bosch Automotive Handbook
This is not your average repair manual. The Bosch Automotive Handbook is a dense, technical reference filled with precise definitions, formulas, and design principles behind modern vehicle systems, including electrical systems and diagnostics.
A must-have for those working on diagnostics or developing automotive systems. Not ideal for beginners, but invaluable for seasoned pros. This book is available on Amazon.
4. Advanced Automotive Fault Diagnosis by Tom Denton
Tom Denton is a trusted author in the world of automotive technology. This book focuses on advanced diagnostics using real-world case studies and troubleshooting processes.
It covers OBD systems, scan tools, sensor data interpretation, and diagnostics strategies used in modern repair shops. ASE certified professionals, diagnostic techs, and repair shop leads will appreciate this book. This book is available at Walmart and Amazon.
5. Motorcycle Basics Techbook by Matthew Coombs (Haynes)
Auto mechanics often expand into motorcycles. This Haynes book explores motorcycle maintenance and repair with the same detail they bring to their car repair manuals.
Great for mechanics who want to branch into motorcycle repair or work at specialized repair shops. This book is available on Amazon and Thriftbooks.
Other Mechanic Resources
While books are still relevant, many mechanics have transitioned to other resources like YouTube videos and podcasts. Here are some of our favorites.
YouTube
YouTube is a gold mine for car repair veterans and DIYers alike. Some of our favorite channels include:
Enright Auto - for new tools and repair techniques
Reddit can be another powerful resource for new techniques plus an online community to answer questions you may have. Some of the best subreddits include:
Investing in a good book isn’t just about reading—it’s about building your skills, your confidence, and your future in the automotive industry. Whether you’re just learning how cars work or studying classical mechanics principles, there’s a resource here that can guide you. The best mechanics know that their education never stops.
In the ever-evolving automotive industry, staying ahead of the curve means constantly learning and growing. For automotive service technicians, certifications aren’t just credentials—they’re powerful tools that open doors to better job opportunities, increased pay, and credibility with customers and employers alike.
Whether you're just starting out or already working in auto repair, understanding the most common types of mechanic certification can help you create a successful, long-lasting career. This guide will break down the most recognized certifications, how to attain them, and why they matter for every auto mechanic who wants to stand out.
Types of mechanic certifications
Mechanic certifications come in many forms, each tailored to different specializations and career goals. The most common types include:
1. ASE Certifications
Issued by the National Institute for Automotive Service Excellence (ASE), these certifications are the gold standard for automotive mechanics. They cover a wide range of specialties, from engine repair to electronic systems and air conditioning.
ASE certification is considered the most prestigious and widely accepted credential in the automotive world.
More about ASE
Founded in 1972, the National Institute for Automotive Service Excellence sets the benchmark for automotive service technicians. ASE offers over 50 different certification tests in categories like:
Engine Repair
Brake Systems
Air Conditioning and Heating
Suspension and Steering
Electrical/Electronic Systems
Engine Performance
Manual and Automatic Transmission/Transaxle
Light Truck and Diesel Engines
Master technicians
There’s also a separate path for master technician status, which is achieved by passing all certifications in the required testing areas for that series. For example, technicians certified in tests A1 through A8 are Master automobile technicians.
Master technician status is not for life. You must keep each one of those certifications current to maintain master technician status. If you lose master technician status due to the lapse of one or more required certifications, it can be reinstated by taking and passing the recertification tests.
How long does it take to become ASE certified?
To become ASE certified, expect to spend anywhere from 1–3 years, depending on your work experience and whether you’re currently enrolled in training programs. Each certification test typically takes 1 to 2 hours to complete and can be scheduled at a local test center.
Being ASE certified shows you’ve mastered the skills needed for the job. It’s a badge of excellence recognized by employers, repair shops, and even customers looking for reliable service.
2. Student certifications
Geared toward high school and post-secondary students in automotive technology programs, these ASE certifications offer a head start in proving foundational knowledge.
What are student certifications?
Student certifications validate entry-level knowledge in core areas of vehicle repair and maintenance. These don’t require work experience and serve as a stepping stone to full ASE status.
Programs approved by the ASE Education Foundation often include student certification exams as part of their curriculum. These are excellent options for students at auto mechanic schools or in a community college training program.
Student certifications are valid for two years and help you build confidence before entering the workforce as an entry-level technician.
3. Manufacturer certifications
These certifications are specific to vehicle manufacturers and offered by companies like Ford, Toyota, GM, and others. Often, auto technicians working in dealerships will pursue these to show mastery of brand-specific systems.
For repair technicians who want to specialize in a particular brand, manufacturer certifications are essential.
Manufacturer training programs
Toyota T-TEN
Ford ASSET
GM ASEP
Honda PACT
BMW STEP
These accredited programs often partner with dealerships to offer real-world, hands-on experience while you earn your credential. These programs can take anywhere from 12 to 24 months and typically require completion of automotive technology coursework alongside on-the-job work experience at a brand-affiliated repair center.
Why they matter
Manufacturer-certified auto technicians often have a faster path to high-paying roles within dealership networks and brand-specific repair shops. These certifications also prepare you to service increasingly complex vehicle systems, especially as brands continue to innovate with hybrid and electric vehicles.
4. Specialty certifications
You’ll also find credentials related to diesel engines, heavy truck systems, collision repair, and even hybrid/electric vehicles.
Each of these certification types plays a unique role in an automotive technician’s career path, and in many cases, earning more than one will make you significantly more marketable in repair shops and beyond.
Depending on your interests, you may also want to pursue:
A/C Refrigerant Certification - Necessary if you want to be able to to buy refrigerant and work on air conditioning service.
Diesel Mechanics Certification – Focused on diesel engines used in commercial fleets and heavy truck applications.
Collision Repair Certification – Great for auto mechanics looking to work in body shops.
Hybrid/Electric Vehicle Certification – A growing field with high demand.
Each of these certifications typically requires completion of a specialized training course and a passing score on certification exams. These programs may be part of a broader certificate program or offered as a standalone credential.
Tek-Tip: Another way to get ahead as a young technician is to be experienced with auto repair shop software so your employer doesn't have to teach you how to use their system.
Benefits of mechanic certifications
Getting certified is one of the most direct ways to turn your hands-on experience into a long-term career asset. Mechanic certifications do more than look good on a resume—they deliver real-world advantages. Here are some of the benefits of completing automotive certifications:
Increased Pay: Certified mechanics typically earn higher wages. According to the Bureau of Labor Statistics (BLS), certified automotive mechanics can earn higher hourly rates, especially in competitive markets.
Job Security: The more certifications you have, the more valuable you are to auto repair businesses.
Professional Credibility: Certification demonstrates a commitment to quality and standards, building trust with customers and employers.
Career Advancement: Certified automotive service technicians are more likely to advance to roles such as shop foreman, master technician, or service manager.
Mobility: Certifications make it easier to move between different types of employers—whether that’s independent repair shops, starting a mobile mechanic business, dealerships, or specialty service centers.
What does the certification process look like?
Most mechanic certifications follow a similar pathway but always refer to the specific instructions for your program.
Step 1: Enroll
Start by enrolling in an automotive technology program. These are offered by community colleges, trade schools, and accredited auto mechanic schools. Many programs are supported by the ASE Education Foundation, ensuring alignment with real-world industry standards.
Look for certificate programs or associate degrees that offer hands-on training. Financial aid is often available for eligible students.
Step 2: Gain work experience
Work experience is critical for most certifications. For ASE certification, for example, you need at least two years of on-the-job experience—or one year plus a diploma from an accredited program. You’ll need to show that you’ve worked on everything from brake systems and axles to manual drive train repairs and electrical systems.
Step 3: Pass certification tests
Most mechanic certifications require passing written or computer-based certification exams. These are typically held at a certified test center. The exams cover a variety of topics depending on the specialty, including engine performance, electronic systems, and automatic transmission repair.
Tek-Tip: Some auto shops/employers will pay your test fees for you.
Step 4: Maintain certification
Many certifications require recertification every five years. Staying current ensures you’re up to date with the latest automotive repair techniques, tools, and systems.
Final thoughts
Becoming a certified mechanic takes dedication, but the payoff is worth it. From better job prospects to increased credibility, mechanic certifications help you build a successful, respected career in automotive repair.
Invest in your future. Get trained, get certified, and become a leader in the ever-growing world of automotive repair.
Thought Leadership
Automotive Mechanic Certifications: The Complete Guide
Mechanic interviews are challenging for both the employer and candidate because the right candidate has to be a fit in personality and technical ability. Plus, the numerous certification types, manufacturer nuances, and shop needs make it even more challenging.
This guide can be used to help repair shops/dealerships ask the right questions and also help technicians be prepared for questions they will likely encounter. Below you will find the most common car mechanic interview questions broken down by mechanic and service advisor level plus tips to ace your next interview.
Top mechanic job interview questions
While every auto repair shop differs in how they run their job interview process, these are some of the most common questions you can expect. Ranging from technical questions to customer service, be prepared to answer these common questions before your next interview.
General interview questions for car mechanics
These common questions cover basic automotive repair experience and relevant work history.
Tell me about yourself and your experience as an automotive technician.
Why do you want to work for our company/shop?
How do you stay up to date with new automotive technologies and repair techniques?
What certifications do you currently hold (ASE, manufacturer-specific, etc.)?
Are you comfortable working weekends, evenings, or overtime if needed?
Technical interview questions for mechanics
These technical interview questions cover more specific hand-on experience and tools/equipment.
Which repairs are you best at?
How much would you estimate your tool inventory to be worth?
What steps do you take when diagnosing a check engine light?
What tools and diagnostic equipment are you most familiar with?
Have you worked with hybrid or electric vehicles?
Do you believe in factory recommended vehicle maintenance intervals?
How comfortable are you with OEM scan/diagnostic tools?
Experience & situational questions for mechanics
These questions help employers understand how you would handle various shop situations and also helps them understand your communication skills.
Can you describe a time when you had to work under a tight deadline?
How do you deal with angry customers?
How do you prioritize tasks when you have multiple vehicles to work on?
What would you do if you made a mistake on a repair? How do you handle accountability?
What do you do if you encounter a vehicle with an issue you've never seen before?
Additional questions to expect
Are you comfortable serving those in need once a month?
Are you comfortable doing a DVI on the majority of vehicles you touch?
How do you handle a high-pressure environment when the shop is busy?
How do you handle a situation where you're unsure about how to fix a problem?
Tell me about a time you went above and beyond for a customer?
Top interview questions for service advisors
While the interview questions for service advisors will be similar to mechanics, there will be small differences. Typically, service advisors will be more customer facing and shops will tailor their questions to focus more on customer service and communication style.
General interview questions for service advisors
Are you comfortable selling repair services?
Are you comfortable working on a commission based salary structure?
Who do you believe has the best after market products?
How do you deal with a customer saying that you are more expensive than their last shop?
How do you win back angry customers?
How do you handle over the phone quotes?
Technical interview questions for service advisors
What are your greatest strengths as a service advisor?
Who do you trust for moving electrical parts?
How do you handle working in a fast-paced environment?
Are you comfortable meeting sales goals and upselling services?
How do you stay up to date with new automotive technology and service trends?
How do you handle stress during busy hours?
Experience & situational questions for service advisors
How do you explain complex vehicle repairs to a customer who doesn’t understand cars?
What steps do you take to build trust with customers?
Have you ever had to deal with a miscommunication between a technician and a customer? How did you resolve it?
Can you describe a time when you turned a dissatisfied customer into a repeat customer?
How do you handle multiple customers needing assistance at the same time?
Additional questions to expect
How do you explain the importance of routine maintenance to a customer?
What experience do you have with automotive service software or point-of-sale systems?
How do you prioritize repair orders and schedule work efficiently?
How do you explain repair estimates to customers?
How would you respond to 1-star reviews?
Job interview tips for mechanics
Research: Not all shops are created equal so make sure to research before applying to make sure they are a good fit. You can also look at online reviews to see what their customers are saying.
Preparation: Use the commonly used questions above to help you prepare for the interview. Practice how you would answer each question and ways you can present yourself well.
Attire: You have 7 seconds to make your first impression and attire is a big part of that. Dress to showcase your professionalism and experience.
Highlight your experience/certifications: Showcasing your certifications and experience can go a long way to in making sure you land the job.
Ask thoughtful questions: Some interviewers will allow you to ask questions during the conversation. Make sure you have a few questions to ask that help you learn more about the shop.
Follow up: if you haven’t heard back from the shop and you are still interested, give them a call and remind them of your interest in the position.
Final thoughts
Interviews are challenging in any industry but mechanic interviews can be even more challenging with the shortage of talent available. This guide will help you either prepare for your next interview or provide you with common questions to ask your next hire. Lastly, always hire for culture fit and talent second. Culture problems are a lot harder to correct than technical car knowledge.
.svg)
.svg)
.svg)
.svg)
.svg)
.svg)
.svg)
.svg)