Chronological feed of NHTSA ODI (Office of Defects Investigation) investigations, newest first. Returns preliminary evaluations (PE), engineering analyses (EA), defect petitions (DP), and recall queries (RQ) — each with NHTSA ID, type code, open/close dates, status, subject, and full description (HTML stripped + raw). Useful for tracking what NHTSA is currently investigating (Tesla FSD, autonomous-vehicle crashes, Rivian suspension, etc.). NOTE: NHTSA's endpoint does NOT support make/model/year filtering — use vehicle.recalls or vehicle.complaints for vehicle-scoped lookups. Public-domain US government records.