POST UPDATED IN November, 2020
The OBD2 protocol is the successor to the OBD - OBD1 (On Board Diagnostic) and has updates and improvements to the vehicle's diagnostic system. It serves to detect chemical, mechanical and electrical faults that affect the emission of polluting gases from the vehicle to the environment and to identify any other damage that the car presents.
The regulations of the OBD2 system are much more extensive than those governing the OBD system, and are linked to other regulations such as ISO and SAE.
The OBD2 system issues an alert to the driver when the level of gas emissions is 1.5 higher than the established parameters. Additionally, the OBD2 checks that all the sensors involved in the gas emissions work well, such as the air intake to the engine or injection. For example, oxygen sensors that are located before and after the catalyst must certify the proper chemical functioning of the catalyst.
When the OBD2 system finds a fault in the vehicle it immediately turns on the fault light, called MIL (acronym in English for Malfunction Indication Lamp) or lamp indicating malfunction in the instrument panel.
All companies that assemble vehicles such as Ford, Chrysler, Chevrolet and Jeep have been forced since 1996 to install the OBD2 system in their new cars.
Best OBD2 scanners
Because the OBD2 system has been extended as a universal component, some developers have designed applications and readers that are fully compatible with the technology used in this system, making it extremely easy to verify all types of faults from a cell phone.
You can observe in real time the revolutions per minute of the engine, acceleration, fuel and air mixture, power, consumption and fuel level, among others.
Another interesting fact is that there is the possibility of "Tuning" your car through an application, connecting a device to the OBD2 port of the car, in this way the warranty is not lost and will remain original when you disconnect it.