SPN 3262 FMI 0/1/2/7 - Aftertreatment 1 SCR Intake Temperature Sensor Fault

What it means

The Engine Control Module (ECM) detects an out-of-range or rationalization error from the Selective Catalytic Reduction (SCR) intake temperature sensor. This sensor monitors exhaust gas temperature before it enters the SCR catalyst to ensure proper Diesel Exhaust Fluid (DEF) dosing.