What is the meaning of OBD-II code P0174?

OBD-II code P0174 refers to a lean condition in the engine's fuel system on bank 2, meaning there is not enough fuel in the air-fuel mixture and too much air on bank 2. The Engine Control Module (ECM) detects this condition through the oxygen sensor and generates the P0174 code. Some of the common causes for the P0174 code include: -Vacuum leaks in the intake system on bank 2 -A clogged air filter on bank 2 -A malfunctioning mass air flow sensor on bank 2 -A malfunctioning fuel pressure regulator on bank 2 -A malfunctioning injector on bank 2 -A malfunctioning oxygen sensor on bank 2 -A problem with the engine's compression on bank 2 To diagnose the issue, a mechanic will typically use a scan tool to retrieve the stored diagnostic trouble codes and perform a visual inspection of the vehicle's intake system, fuel system, and vacuum hoses on bank 2. They may also check the compression of the engine and the fuel pressure on bank 2. The resolution of the problem will depend on the cause of the code. It can include fixing a vacuum leak, replacing a clogged air filter, replacing a malfunctioning sensor, repairing or replacing a malfunctioning injector, or replacing a malfunctioning oxygen sensor. In some cases, the problem may be caused by a more serious issue with the engine, such as a faulty cylinder head or a blown head gasket.