Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Do you have any other symptoms? Engine knocking, no start, etc?
You have a couple of different codes pointing to different areas. The first place I would look is the cam position sensor. Anytime I see the p0340 that's the first place to look. The p0011 is in relation to that error, but could also be caused by low oil level. If you oil level is correct then I would focus on the cam sensor.
Do you plan to repair it yourself?
How does the oil level look?