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P1093

Fuel Rail Pressure Low

High
OBD-II fuel
What it means

Rail pressure low during high demand (OEM-defined) — supply/return or HPFP wear.

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Related codes
SPN 157 / FMI 0

Injection Rail Pressure — Above Normal (Most Severe)

fuelHigh
 SPN 157 / FMI 1

Injection Rail Pressure — Below Normal (Most Severe)

fuelHigh
 SPN 94 / FMI 1

Fuel Delivery Pressure — Below Normal (Most Severe)

fuelHigh
 P0087

Fuel Rail/System Pressure Too Low

fuelHigh
 P0088

Fuel Rail/System Pressure Too High

fuelHigh
 P062D

Fuel Injector Driver Circuit (Bank 1)

fuelHigh

General reference only — always confirm against the OEM procedure for your specific engine.