Will AutoZone Diagnose My Car for Free?

Yes—AutoZone will typically scan your Check Engine Light (CEL) for free with an OBD-II code reader and give you a printout of trouble codes and likely fixes. The service is quick and useful for initial triage, but it is not a full mechanical diagnosis and availability can vary by state and store policy.

What AutoZone’s Free Service Includes

AutoZone’s “Fix Finder” service uses an OBD-II scanner to read diagnostic trouble codes (DTCs) from most 1996-and-newer vehicles. Associates can explain the codes at a high level and provide a report with possible causes and parts that might be needed.

What to Expect During a Visit

The following points outline the typical experience and deliverables when you request a free code scan at AutoZone.

• They connect an OBD-II scanner (or guide you to connect it, depending on local rules) to read current and pending engine codes.
• You receive a code report showing the DTCs (e.g., P0301) and general descriptions (e.g., cylinder 1 misfire detected).
• The report may include likely causes, severity guidance, and suggested parts or maintenance items.
• Many stores can also provide basic readings related to ABS or maintenance lights on supported vehicles, though coverage varies by make/model.
• They can test your battery, starter, and alternator for free as a separate service, often without removing parts.

Taken together, these steps provide a quick snapshot of what your car’s computer is reporting and can help you decide on next steps or parts to consider.

What the Free Scan Does Not Do

It’s important to understand the limits of a free code read so you don’t confuse it with professional diagnostics.

• No definitive root-cause diagnosis—codes point to systems or symptoms, not guaranteed failed parts.
• No in-depth testing—no smoke tests for vacuum leaks, oscilloscope analysis, or manufacturer-level bidirectional controls.
• No disassembly or repairs—associates won’t remove components or perform mechanical work.
• Code clearing is restricted—some stores may clear CEL codes upon request; others won’t due to policy or state regulations. ABS/SRS code clearing is commonly not performed.
• Limited coverage for non-engine systems—airbag (SRS), transmission, and advanced driver-assistance systems typically require specialized tools.

In short, a free scan is a starting point. Complex issues usually need a technician with advanced equipment and time for pinpoint testing.

Availability and Restrictions

AutoZone offers free code scans at most U.S. locations, but rules differ by jurisdiction and store.

• State and local regulations may limit what associates can do—for example, some locations require that you connect the scanner yourself, and many prohibit associates from clearing codes.
• Service coverage for ABS or maintenance lights depends on your vehicle and the store’s equipment.
• If you drive a pre-1996 (OBD-I) vehicle, scanning may not be supported; however, some stores offer loaner tools if compatible.
• Weather, safety, or parking constraints can affect whether curbside scanning is offered.

Before you go, it’s wise to call your local AutoZone to confirm what services are available for your vehicle and any local limitations.

Time, Cost, and Practical Tips

Most free scans take just a few minutes and do not require an appointment. To get the most from the visit, consider the following.

• Bring details about recent symptoms (rough idle, hard starting, poor fuel economy) to help interpret codes.
• Note recent work or parts replaced, as new faults can be related.
• Ask for the printed report or a text/email copy for your records and mechanic.
• If the light is flashing, drive minimally—this can indicate a severe misfire that can damage the catalytic converter.

These steps help translate a quick code read into clearer next actions, whether DIY or professional repair.

When You Might Need a Mechanic Instead

There are situations where a professional diagnostic is the best next step.

• Intermittent or complex issues that persist after obvious fixes.
• Multiple related codes across systems (e.g., engine, transmission, ABS).
• Electrical faults requiring wiring checks, pinout tests, or module programming.
• Manufacturer-specific problems that need OEM-level scan tools and service information.

Expect a professional diagnostic fee—commonly $100–$200—which typically includes deeper testing and a repair plan.

Bottom Line

AutoZone’s free scan is a convenient, no-cost way to see what your car’s computer is flagging, but it’s not a substitute for a full diagnostic. Use it to understand the codes, address simple issues, and decide whether you need a mechanic for further testing.

Summary

AutoZone will usually read your Check Engine Light codes for free and provide a report with likely causes and parts suggestions. The service is quick and helpful for initial troubleshooting, though it’s limited to code retrieval and basic guidance. Availability and features can vary by state and vehicle, and complex problems still require a professional diagnostic to pinpoint the true cause.

Will AutoZone give you a free diagnostic?

What locations offer the Free Fix Finder Service? Every single one of our more than 6,200 locations in the United States offer our Free Fix Finder Service during business hours.

Does AutoZone diagnose car issues?

Yes, AutoZone can provide a basic diagnosis for free using their Fix Finder service, which reads diagnostic trouble codes (DTCs) from your car’s computer when warning lights are on. However, AutoZone’s employees are not qualified mechanics, and they only provide a code and a list of potential fixes from a database. You still need to interpret the code, understand its potential causes, and perform the proper diagnostic tests yourself or take it to a qualified mechanic for an accurate diagnosis. 
What AutoZone’s Fix Finder Service Does

• Scans for Codes: When a warning light is on (like the check engine light, ABS light, or maintenance light), an AutoZone employee can plug their scanner into your car’s OBD-II port. 
• Provides a Report: The scanner pulls the diagnostic trouble code (DTC) from the car’s computer and may provide a printed report or email with information about the code. 
• Offers Potential Solutions: The report includes information derived from a database of technician-verified fixes, suggesting possible causes and solutions for the codes found. 
• Tests Other Components: AutoZone also offers free testing for other components like your battery’s voltage, brake pad life, and tire pressure monitoring system (TPMS) status. 

What AutoZone Doesn’t Do 

• Provide a Professional Diagnosis: Reading a code is not the same as a comprehensive diagnostic. AutoZone’s Fix Finder provides a starting point, not the complete picture of what is wrong.
• Have Qualified Technicians: The staff at AutoZone are primarily parts salespeople and are not mechanics, so they are not equipped to perform in-depth diagnostics.
• Fix Your Car: AutoZone’s goal is to sell auto parts, not to fix your car.

When to Use AutoZone

• For a “Hint”: Use the service to get a basic idea of what the code might indicate, especially if you have a working knowledge of cars. 
• For Free Information: It’s a valuable resource for getting a free code reading when a warning light appears. 

When to Seek Professional Help

• When You Need a “Real” Diagnosis: Opens in new tabIf you’re not comfortable interpreting the codes or performing troubleshooting, a professional mechanic can perform the necessary tests to identify the exact cause of the problem. 
• When You Want a Confirmed Fix: Opens in new tabTo ensure the correct part is replaced and the issue is properly resolved, a qualified mechanic’s expertise is invaluable. 

How much is a diagnostic test at AutoZone?

The free test takes less than a minute, and you’ll get an easy to understand report printed and emailed. How to get your warning light checked: If you see a warning light, come to AutoZone.

How much does it cost to run a diagnostic on a car?

Car diagnostic test prices

State	Labor rate	Car repair cost
Florida	$142.74	$253.55
Texas	$145.86	$251.67
Georgia	$145.34	$262.37
California	$144.56	$268.48