What causes a SPN 3260 code?

SPN 3260 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 3260 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3260 active.

How do I fix SPN 3260?

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 3260

SPN 3260 Aftertreatment 1 SCR Intermediate Oxygen Sensor Circuit

What it means

Indicates a communication or electrical circuit failure within the Selective Catalytic Reduction (SCR) intermediate NOx/Oxygen sensor system.