Keep a few spare LED work lights and a tube of dielectric grease in your toolbox. You can usually diagnose and fix a D1A code in less than 30 minutes.
(SPN/FMI) are appearing on the screen alongside the "DIA" text?
: On certain John Deere models with a keypad (like skid steers), the display may prompt for an anti-theft code
Use the Hazard Warning switch (flipping it on and then off) to "Enter" a unit and see the specific numbered codes stored inside.
