Canon MP258 not printing dark yellow

[princepriyu]

hi i am using canon inkjet printer PIXMA MP258 color printer (with CISS) i use it to print daily without fail. but from yesterday it is not printing yellow color. in nozzle check it prints light yellow but not the dark yellow. even while printing other documents with yellow it skips the yellow colour
please geniuses seniors help me. i have also uploaded the scanned nozzle check print