IA SSB3124

Requires original farm equipment manufacturers to provide diagnostic tools, documentation, embedded software, and replacement parts for diesel exhaust fluid (DEF) systems to equipment owners and independent repair providers on fair and reasonable terms.

Defines "diesel exhaust fluid system" as a selective catalytic reduction emissions control system operated by digital electronic components, integrated into diesel-powered farm equipment used exclusively for agricultural production.

Grants the Attorney General rulemaking and enforcement authority, with district courts authorized to issue injunctions against violations; county attorneys may also institute suits on behalf of the state.

Protects manufacturer trade secrets from mandatory disclosure and preserves existing contractual agreements between interest holders and other parties except where agreements conflict with the chapter's requirements.

Establishes penalties for violations, creating a "right to repair" framework specifically for farm equipment DEF systems while balancing manufacturer intellectual property concerns.