There are differences between the sensors that control the computer in terms of the volume of air that enters the intake manifold. To indicate the volume of air flow the Power Train Control Module (PCM), with the objective of calculating the fuel and the form of synchronization, is based on the information of three sensors: MAP (Multiple Absolute Pressure Sensor) MAF (Air mass flow sensor) and TPS (Accelerator position sensor).
The PCM needs these three sensors to be precise, in terms of the time to open the injectors and the spark that is needed to reach the stoichiometric ratio, namely 14.5 / 1.
In the event of faults, either mechanical or electrical, by one of these sensors, causing instability in the system, the DTC code P0068 OBD2 is established.