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Discover where to get your check engine light diagnosed for free at major auto parts and repair chains like AutoZone, O'Reilly, Advance Auto Parts, Pep Boys, Firestone, and Goodyear.
Vehicles 1996 or newer can be scanned by plugging our O’Reilly VeriScan code reader into your OBD-II system – just ask for a free Check Engine light diagnostic.
Got a check engine light on? The free test takes less than a minute and you'll get an easy to understand report printed and emailed. It's the most complete, free warning light report backed by technician verified fixes.
Check engine light on? You can use AutoZone's Free Fix Finder Service to get a free code reading and vehicle health report.
You can also visit O’Reilly Auto Parts and ask one of our parts professionals about our free Check Engine Light Testing with O'Reilly VeriScan to have your OBD-II codes scanned at your local store. You'll be provided with an O'Reilly VeriScan report to help you identify possible causes and repair solutions for your illuminated Check Engine light.
OBD-II (Check Engine Light) Trouble Codes. Welcome to OBD-Codes.com, your headquarters for everything OBD-II related. For more information on what OBD codes are, OBD-II codes explained, explanation of fuel trims, or answers to other questions, visit our FAQ area.
Instead of figuring out where to get a CEL checked for free and taking an adrenaline and anxiety fueled trip to the local auto parts store hoping your engine doesn’t break, you can check the light yourself using an OBD2 scan tool and save yourself the hassle.
If your Check engine light is on you may have a serious problem. Scan your codes and follow the chart to determine what the code means. Some parts stores will scan your codes for free.
Check engine light on? You can use AutoZone's Free Fix Finder Service to get a code reading and vehicle health report.
Hundreds of possible problems can cause the check engine light on a car. The most common issues are spark plugs, oxygen sensors, and catalytic converter failure. Instead of guessing what is wrong, use an OBD-II scanner to read the fault codes.