The DTC code P0473 OBDII means that there is an electrical circuit problem in the received signal from Exhaust Pressure Sensor (EPS) The reason for setting this code has to do with the EPS signal, which is not adjusted to the intake manifold pressure or ambient air pressure. This is due to electrical problems.
The code P0473 and P0471 can appear at the same time. Although both codes differ because the code P0473 is just for electrical problems, while P0471 is set because of a mechanical or electrical failure. Thus, it is advisable to solve the code P0473 first. Although the solutions to this code vary according to the manufacturer, the fuel (gas or diesel), and other variants.