How to diagnose your check engine light
0:49
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Video by Mr. Build It
Mr. Build It
What happens here
This video provides a step-by-step guide on how to diagnose a vehicle's check engine light using a handheld diagnostic scanner, specifically highlighting the free 'Fix Finder' service available at AutoZone. The process involves identifying the warning light, obtaining a scanner, connecting it to the vehicle's OBD-II port, performing a scan to retrieve Diagnostic Trouble Codes (DTCs), and reviewing a detailed report with an AutoZone employee to understand the issue and get repair recommendations. While the video showcases a general engine performance code (P2646), the procedure is identical for emission system faults.
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