DTC Detection Logic

WARNING: This page is about a different car, the 2013 Infiniti M56. However, it is still accessible from the selected car via links, so may be relevant.

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible cause
P0191	Fuel rail pressure sensor	Fuel rail pressure remains at more than 14.5 MPa (147.9 kg/cm² , 2102.5 psi) for 0.2 seconds or more during ignition ON.	Harness or connectors (Fuel rail pressure sensor circuit is open or shorted.) (Power steering pressure sensor circuit is open or shorted.) (Low fuel pressure sensor circuit is open or shorted.) (Engine oil pressure sensor circuit is open or shorted.) Fuel rail pressure sensor Power steering pressure sensor Low fuel pressure sensor Engine oil pressure sensor