Reading diagnostic codes is a quick way to understand what’s causing a vehicle’s warning light or performance issue. Using an OBD2 scanner, you can retrieve standardized error codes that point to specific systems—such as fuel delivery, emissions, or sensors. Each code, like P0171 or P0420, corresponds to a known problem area, helping narrow down the cause. Reading codes doesn’t fix the issue but provides a clear starting point for diagnosis. It’s a valuable step before any repair, saving time and money. Always record the code and consult a reliable guide or professional for accurate interpretation. This simple action empowers drivers to take control of their vehicle’s health.