obd‑ii fault codes
Automotive Diagnostics: Fix Warnings Before Big Bills
Reading your car's OBD-II fault codes lets you identify problems in seconds, preventing expensive repairs and keeping the family safe. 95% of drivers who use a portable OBD-II scanner avoid at least one major service bill each year (GEARWRENCH). Automotive Diagnostics: OBD-II Fault Codes, Your Dashboard’s Secret