TYM Tractor Dashboard Lights & DEF System Explained

What happens here

The presenter starts the TYM tractor and explains that the warning lights for the DEF system and the check engine light were previously illuminated. He notes that a 'regen' cycle was performed earlier, which may have cleared these lights. He states that the tractor's manual indicates 'see dealer' for such issues, which he finds inconvenient given the dealer's distance.

Goal: Demonstrate previous warning lights and explain the DEF system's function