Fuel System DTC Codes

Fuel injector, fuel pump, fuel pressure, and fuel rail OBD-II codes — with diagnostic notes for tuners.

166 codes in this system Depends on root cause

About Fuel System codes

Fuel system codes typically indicate genuine fuel delivery issues — clogged injector, failing HPFP, dirty LPFP, leaking fuel rail. Suppress only after the underlying cause is rectified.

All 166 codes in Fuel System

Browse by other systems

DPF / Particulate Filter (4)EGR (25)AdBlue / SCR / NOx (56)Catalyst (37)Turbo / Boost (34)Ignition / Knock (73)O2 / Lambda Sensor (58)Air Metering (MAF / MAP) (13)Cooling System (69)Misfire / Cylinder (40)Throttle / Pedal (79)Camshaft / VVT / Timing (72)Transmission (85)CAN / Communication (15)Generic Sensor / Circuit (422)Other Powertrain (334)