What causes a SPN 498 code?

SPN 498 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a SPN 498 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 498 active.

How do I fix SPN 498?

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

J1939 SPN

SPN 498

J1939 SPN 498 — Fuel/Air parameter

What it means

SPN 498 indicates an issue with the Engine Fuel Demand or Water-in-Fuel indicator, most commonly referring to the presence of water in the fuel system or a circuit fault in the WIF sensor.