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What is the average cost for a check engine light diagnostic?

The average cost for a check engine light diagnostic can range from $20 to $100, depending on various factors. The check engine light is a warning indicator in a vehicle that alerts the driver to an issue with the vehicle's emissions control system or other engine-related problems.


Factors Affecting the Cost of a Check Engine Light Diagnostic


Several factors can influence the cost of a check engine light diagnostic, including:



  • Diagnostic Fees: Many auto repair shops charge a diagnostic fee, which can range from $20 to $100, to plug in a diagnostic tool and read the trouble codes that triggered the check engine light.

  • Labor Costs: The labor cost for a technician to diagnose and repair the underlying issue can add to the overall cost. Labor rates can vary depending on the location and the expertise of the technician.

  • Parts Replacement: If the diagnostic reveals a problem that requires replacing parts, the cost of the parts and the labor to install them will be added to the overall cost.

  • Complexity of the Issue: More complex problems, such as issues with the engine's computer or emissions system, may require more time and specialized equipment, resulting in higher diagnostic and repair costs.


It's important to note that the cost of a check engine light diagnostic can also vary depending on the make and model of the vehicle, as well as the location of the repair shop.


Tips for Reducing the Cost of a Check Engine Light Diagnostic


Here are some tips to help reduce the cost of a check engine light diagnostic:



  • Shop Around: Compare prices and diagnostic fees at different auto repair shops in your area to find the most affordable option.

  • Use a Diagnostic Tool: Some auto parts stores or DIY mechanics may offer free or low-cost diagnostic services using a handheld diagnostic tool, which can help identify the problem before taking the vehicle to a repair shop.

  • Consider a Dealership: While dealerships may charge higher labor rates, they often have access to more specialized diagnostic equipment and may be able to identify and resolve the issue more efficiently.

  • Perform Routine Maintenance: Regular maintenance, such as oil changes and tune-ups, can help prevent some issues that trigger the check engine light, potentially reducing the need for costly diagnostics and repairs.


By understanding the factors that influence the cost of a check engine light diagnostic and taking proactive steps to address the issue, you can help minimize the overall cost of maintaining your vehicle.

How much should it cost to diagnose a check engine light?


The average cost for a Check Engine Light Diagnosis & Testing is between $88 and $144. Labor costs are estimated between $88 and $144.



What is the first thing to check when the check engine light comes on?


Check your gas cap first. Many vehicles have a loose gas cap indicator that will be triggered before your check engine light comes on. If your gas cap is loose or the seal is not tight, the vapor leakage can cause your fuel system to trigger the check engine light.



Do most mechanics charge for diagnostic?


Some auto repair shops charge for auto diagnostic services, but some places, such as autoparts stores, offer to scan your vehicle for free.



How much does AutoZone charge for diagnostic test?


AutoZone will charge it for free.



Where can I get my check engine light checked for free?


Many auto parts stores offer code readings as a free service. Advance Auto Parts, AutoZone, and O'Reilly are among the stores that will. (So do many other chains and independent stores. Check with your local store to find out whether they offer this service, and whether it's free.)



How much is a diagnostic test at AutoZone?


AutoZone will charge it for free.



Do all mechanics charge a diagnostic fee?


Depends where, usually a car dealer would charge you at least a half an hour diagnostic fee. A private garage or a reputable repair shop probably won't charge you anything but I doubt very much that they can't fix it. There's always a way to fix something.



Does AutoZone Diagnose check engine light for free?


You can use the Free AutoZone Fix Finder Service to get a complete report on your vehicle so you can fix the problem quickly and put your mind at ease. #GetInTheZone.



How much should you pay for a diagnostic test?


On average, the cost of an on-board diagnostic test is between £50 and £100.



How much is a full diagnostic check?


Car diagnostic test prices

StateLabor rateCar repair cost
Florida$142.74$253.55
Texas$145.86$251.67
Georgia$145.34$262.37
California$144.56$268.48


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.