First off I would suggest replacing the Vanos check valves at the same time. Also if you can get the lifters for $100 for all 24, may as well as preventative maintenance. My intake was completely clogged with grit and metal, I also had fine metal in the oil.
The first thing I did was replace the Vanos check valve/oil filter and that cleared up the 2A82 code, also the intake Vanos sensor (did nothing) but I still had 2A98 and 2A99 as well as limp mode. The car has 180k miles and I picked it up thinking I was only going to be swapping the Vanos sensor or camshaft sensor, which I did on another E90 previously.
I guess not too bad since I paid $3500 for the car. It was a slight impulse buy at 8PM with no scanner.
The intake and exhaust ledges Are priced at $50 on this post, but when I checked pricing they're $450. Any working around for this? Mine have quite a bit of wear(almost looks like oxidation).
