Fuel injectors play an important role in vehicle performance and efficiency. They provide the cylinders with the necessary amount of air/fuel mixture.
Vehicle manufacturers have incorporated an injector into each cylinder. However, in some cases, operation relies on a single fuel injector for all cylinders. These injectors have an internal electromagnet that is actuated to open and close the fuel passage.
P0272 OBD2 fault code will be set if the Powertrain Control Module (PCM) determines that there is an erratic operation of the injector on cylinder 4.