According to recent media reports, Maruti Suzuki would recall large number of Swift Dzire compact sedans due to faulty fuel pump components. (rediff.com)
Nissan Serena S - Hybrid recalled for faulty fuel pressure sensor — CBU units in Malaysia affected (paultan.org)
The P0420 code seems to indicate a few different possible points of failure including faulty fuel injectors, I'm just unsure what my best mode of attack would be (short of taking it in to a mechanic — unless this is necessary). (mechanics.stackexchange.com)