2009 Honda CRV Engine Code P0843

Hello. I'm getting an engine code P0843 from my 2009 Honda CRV. After some research it looks like it's probably a bad transmission oil pressure switch that needs to be replaced. I've cleared the code, driven around and it's come back.

My question is which one do I need to replace? Part 9 (28600-RCL-013) or 10 (28600-RCR-004)? Is there a way to tell which one just from the code or is further investigation/testing needed to determine which one?

http://www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&catcgry1=CR-V&catcgry2=2009&catcgry3=5DR+LX+%282WD%29&catcgry4=KA5AT&catcgry5=AT+SOLENOID

http://www.amazon.com/Honda-28600-RCR-004-Automatic-Transmission-Pressure/dp/B00HVOGLUQ

http://www.amazon.com/Element-Transmission-Pressure-28600-RCL-013-28600-RCL-003/dp/B00K6CN7K2

Thanks!