P0021 Camshaft Position Actuator A - Bank 2 Timing over-Advan

[brianxmurray]

I own a 2002 Nissan Pathfinder 4 x4 SE. Recently the check engine light came on and I took it to a local auto parts store to get dianosed. The salesperson gave me the following information and a business card for his friend down the street. I am wondering if this is an easy fix that I can take care of or should I let a professional do it for me. Any help is appreciated! The error code verbatium is:

P0021 Camshaft Position Actuator A - Bank 2 Timing over-Advan