This study examines corporate sustainability implementation in leading Asian automobile firms through in-depth scrutiny of sustainability reporting frameworks, environmental performance indicators, and governance structures. Adopting content analysis research design, this research analyzed 18 sustainability reports of six leading companies (Toyota, Nissan, Honda, BYD, Geely, and Hyundai) for the period 2022-2024, supplemented with regulatory filings and third-party ESG ratings.This study reveals high heterogeneity of sustainability maturity across Asian markets. Japanese and South Korean producers demonstrate higher consistency of global reporting standards (GRI, TCFD, SASB) with governance transparency scores of 4.37-4.57, while Chinese producers have significantly lower scores (2.90-3.17). Conversely, Chinese firms have more ambitious environmental targets, with BYD achieving 65% utilization of renewable energy versus 19-28% for Japanese firms and carbon neutrality targets by 2030 vs. 2050 for Japanese firms. 156 unique implementation challenges are identified by the research, and supply chain complexity (100% incidence, 4.2 severity score) and technology transition costs (83% incidence, 4.0 severity score) are major roadblocks that require industry-wide collaboration. Five-year cumulative financial requirements for sustainable transformation are put at $31.1 billion. These findings provide insights into divergent evolutionary paths of sustainability adoption in institutional contexts, suggesting that technological advancement can precede governance maturation in developing economies. The research contributes to corporate sustainability literature by demonstrating how environmental performance and governance transparency can develop simultaneously, particularly in rapidly industrializing markets with conducive policy settings.