Would you just change the oil pressure sending unit? This is a 2005 SRX with a 3.6L.

 

Ok I changed the sensor and now the code is only in the history. 20 minute install. If you end up doing this, you just have to remove the airfilter tube and the engine cover to get to it. Then access is pretty easy. It's right under where the oil filter goes, the sensor itself will require a 27mm deepwell with an extension, nothing to it. So far so good.