Ray said component manufacturers are already aware of underlying changes in the industry and they are aligning their capacity accordingly.However, certain component suppliers for turbochargers and fuel injection component may witness some impact on their revenue and profitability, Ray pointed out.However, diversified companies across products and segments, such as passenger vehicles, commercial vehicles, two-wheelers and tractors, would be more insulated from such shocks, Ponniah explained.Specific component firms manufacturing products for turbochargers, feul injection, diesel filters and a few engine components (diesel power train typically has more content than petrol engines) would be more impacted than process capabilities companies, Pavethra Ponniah, Vice President and Sector Head, Corporate Sector Ratings at ICRA, said.The high cost of upgrading existing diesel engines to the BS 6 norms has prompted the automakers to take the hard decision."Most automotive manufacturers in India are well-prepared to meet the BS 6 emission regulations from 2020 as they have been exporters of vehicles/ automotive components to countries where Euro 6 standards exist,” Prashanth Doreswamy, Market Head at Continental India and MD at Continental Auto-motive India, said.At present diesel cars at Maruti, which sells one car out of two bought in the country, account for almost a third of its sales. Mahindra, the third biggest passenger vehicle maker, and Tata Motors also joined in.He said in April 2018, ICRA has estimated that diesel share in passenger vehicles will decline below 25 per cent by FY2022. Moreover, disel cars meeting BS 6 fuel emission norms would be costlier by Rs 2 lakh to Rs 3 lakh