How to replace a Camshaft Position Sensor in a Porsche Boxster

[BoxMann]

I got a CEL, scanned the OBD, and I get this:

P0349 Camshaft Position Sensor "A" Circuit Intermittent (Bank 2)

A few questions:

1) Does Bank 2 mean for cylinders 4 - 6?

2) If so, what's involved in removing and replacing it? Do you need to remove the top engine cover or is it accessed from behind the seats, or some other way? (Seems that it's a totally different procedure depending on whether its the Bank 1 or Bank 2 sensor)

3) Does replacing it solve the problem, or could something else be causing it to act this way?

4) Finally, is there any possible way this could be an early warning of an impending IMSB failure? (I know there aren't any clear warning signs, but I believe there are a couple of tiny ones)

As you can see below, I have a 2004 S.

Thank you.