P2138 2006 Nissan Altima Sedan -

Question

do I need the whole throttle body or do I change pedal position sensor.
auto stores are showing throttle/pedal position sensor/switch D/E
voltage currelation.

Answer 1

depends what is the exact problem you have, I would start by cleaning the throttle body and doing any idle air relearn

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

if that does not help you may have to replaced the throttle pedal sensor, which is attached to the gas pedal.