Free OBD2 resources for diagnostics and research
Use these resources to reference OBD2 codes, help drivers find safer first checks, build community posts, and link back to the original OBD2HQ diagnostic guides.
Open OBD2 code dataset
2223 OBD2 codes
Embeddable OBD2 lookup widget
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Dashboard warning light image library
ABS, battery, oil, coolant, SRS, TPMS
Diagnostic checklist
Freeze-frame, live data, first checks
Linkable diagnostic source kit
Dataset, widget, attribution, editorial link guidance
Most watched OBD2 code report
Last reviewed 2026-07-14
Attribution: link to OBD2HQ when you use the dataset, widget, warning-light library or checklist publicly. Clean editorial links from forums, guides and tool pages help keep the resource free.