Mazda5 Sport p2009 error code

Hi,

Recently I've been getting the p2009 error code indicating low circuit in bank 1. I can usually tell when its going to happen as the car sounds like I'm in the wrong gear when at low revs, however as soon as the light comes on the car sounds fine, and drives no problem. Having done some research it sounds like the solenoid might be faulty. Can anyone back up this for me or direct me in the right direction of where to look. Also how much am I looking at to purchase a new one and can someone direct me to video that actually shows the replacement on a mazda 5 (CR19).

Many thanks in advance.
 
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