P2101 2009 Nissan Altima Sedan -

Question

P0725 2009 Nissan Altima Sedan
The above code came up at the same time.
What does this mean?

Answer 1

P2101 is related to the throttle body, you can start by cleaning it and doing idle air volume relearn

if you still have issues after the idle air volume relearn is done and the throttle body might be bad 

 

http://nissanhelp.com/diy/altima/projects/nissan_altima_idle_air_volume_learning.php

 

P0725 is related to the crankshaft position sensor which is most likely bad.

it is on the passenger side near the axel shaft 

see picture below