Your Honda city 03 has a grinding sound when rpm reached between 1500 to 1800 it happened after dismantled the oil pan for crack repairing the sounds could be heard when transmission at 'D' 'N'?

If a 2003 Honda City is making a grinding sound after repair of the oil pan, it might be possible that the mechanic left something in the oil pan when finished with the repair. The oil pan should be removed again to investigate the noise.