Since 1996 in EU and since 2000 in Europe, the OBD (On-Board Diagnostics) is mandatory for all the cars manufactured. This protocol is used to verify the smoke emissions and check if any car is between the parameters stablished in every country. Also detect engine failures without need to check the engine manually, identifying accurately the problems reducing the repairing time and cost.
OBD-II is a sort of computer which monitors emissions, mileage, speed, and other useful data. OBD-II is connected to the check engine light, which illuminates when the system detects a problem.
Scan tools can be used to make sense of the diagnostic trouble codes and collect data on other aspects of vehicle’s performance.