Hey I posted this in 5th gen. But ive had 2 4th gens and i know the 4th gen community is more active and might be able to help me.

So i have P0340, P1800 , P021, and P0011, only the P1800 is not related to Camshaft sensor. I won't be able to take it to a shop until Monday to get checked out. But is it safe to say I should go ahead and get the sensor? Or should I wait until I go to the shop. However, my car isnt stalling out(yet) It does however shake a little at idle, and idles really low, like 600,700. I do think i have an exhaust leak, not sure if if the camshaft sensor would contribute to that or if thats a separate issue. Oh and I read somewhere that an 02 sensor can cause the camshaft sensor code? Any truth to that?
BTW: I called Nissan and my car isnt a part of the Camshaft Sensor recall.

Car is 2002 Maxima Se 6 Speed

 

Today when I was driving home is started flashing then went away. I guess its only temporarily gone. But any ideas? Thanks in advance