10 Things Your Mechanic Can Legally Do Without Telling You
Car repairs can be confusing, even stressful. Most of us trust our mechanic to keep us safe and our vehicles running. But there are things your mechanic can legally do without telling you, and knowing these can help you avoid surprises. This matters because your car is a big investment, and you deserve to know what’s happening under the hood. Understanding your rights and what’s allowed in the auto repair world can save you money, time, and headaches. Here’s what you need to know about what your mechanic can do—legally—without telling you.
1. Use Aftermarket Parts Instead of OEM
Your mechanic can legally use aftermarket parts instead of original equipment manufacturer (OEM) parts unless you specifically ask for OEM. Aftermarket parts are often cheaper, but they may not fit or perform exactly like the originals. If you only want OEM parts, please specify this upfront. Otherwise, your mechanic can choose what’s available or affordable for them. This is common practice in the auto repair industry and is allowed by law in most states.
2. Charge a Diagnostic Fee
Mechanics can charge you a diagnostic fee for checking out your car, even if you don’t get the repair done. This fee covers the time and equipment used to find the problem. Many people assume diagnostics are free, but unless the shop advertises free diagnostics, it can charge you. Always ask about diagnostic fees before leaving your car.
3. Perform Minor Repairs Without Approval
If your mechanic finds a small issue while working on your car, they can legally fix it without calling you, if it’s under a specific dollar amount. Many states set a threshold, like $50 or $100, for repairs that don’t require your approval. This means you may see additional charges on your bill for items you didn’t discuss. To avoid surprises, ask your mechanic to call you before doing any extra work, no matter how small.
4. Mark Up Parts Prices
Mechanics can legally mark up the price of parts they use in your repair. The markup covers their time sourcing the part and handling inventory. This is standard in the industry, and there’s no law requiring them to tell you the original price. To determine the markup, you’ll need to request a breakdown of parts and labor on your invoice.
5. Subcontract Work to Another Shop
Your mechanic can send your car to another shop for specialized work, like transmission or body repairs, without telling you. This is legal as long as the work gets done. But you might not know who actually worked on your car or what their qualifications are. If you care about who’s handling your vehicle, ask your mechanic directly if they subcontract any work.
6. Use Rebuilt or Remanufactured Parts
Mechanics can use rebuilt or remanufactured parts instead of new ones, unless you specify otherwise. These parts are often less expensive and can work just as well, but they may not last as long as new parts. If you want only new parts, make that clear before the repair starts. Otherwise, your mechanic can choose what fits your budget or theirs.
7. Dispose of Old Parts Without Showing You
Unless you ask, your mechanic can throw away old parts after replacing them. Some people like to see the old parts to verify the work was done, but there’s no law requiring the shop to show them to you. If you want to see or keep the old parts, tell your mechanic before the repair.
8. Test Drive Your Car
Mechanics can legally take your car for a test drive to diagnose problems or check repairs. They don’t have to tell you every time they do this. Test drives are a normal part of the repair process, but if you’re concerned about mileage or privacy, let your mechanic know.
9. Use Shop Supplies and Charge for Them
Most repair shops charge a fee for shop supplies—things like rags, cleaners, and small hardware. This fee is usually a percentage of your total bill. Mechanics don’t have to itemize these charges or tell you exactly what you’re paying for. If you want details, ask for an explanation of shop supply fees.
10. Recommend Unnecessary Maintenance
Mechanics can suggest extra maintenance that your car’s manufacturer doesn’t require. This is legal, and sometimes it’s even helpful, but it can also lead to unnecessary spending. Always check your owner’s manual or a trusted source, such as the NHTSA, before agreeing to extra services. If you’re unsure, get a second opinion.
Protecting Yourself as a Car Owner
Knowing what your mechanic can legally do without telling you puts you in control. You don’t have to accept every charge or repair at face value. Ask questions, request detailed invoices, and read your car’s manual. If something doesn’t feel right, you can always get a second opinion or check with your state’s consumer protection office. Staying informed helps you avoid surprises and keeps your car—and your wallet—safe.
Have you ever been surprised by something your mechanic did? Share your story or tips in the comments.
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