When i scan for any error codes only that time P0021 comes up.

Question

# always have a hard hit while changing gear to Drive from park mode.
# acceleration performance varies quite a lot while driving.
# replaced crank and camshaft sensor but no luck.
#After clearing code P0021, it comes back after couple for minutes

Answer 1

P0021 Intake valve timing control performance Bank 2

This mostly caused by the variable valve timing solenoid rather than the cam and crank sensor