Rich means
lower MPG, and too much fuel, so expect to replace expensive laqmbda sensors, and possibly your cat in the future.
In regards to mine, it may be fixed, to a certain extent. no longer getting the lean code (at present) But it seems i have a boost leak somewhere, so i'm out in the garden searching for it at the mo.
It seems it may have been one or two things.
When the N249 is removed the left N112 has a small cap on it, it seems that the cap was not doing its job and was leaking, this was replaced with a small section of silicone, with a bolt in the end to seal it.
The other was a T piece under the inlet mani, i seems that after Goble pointed this out, i was looking at the wrong thing, there is a T piece of tubing, the one end of which connects under the inlet mani, (will post a pic soon) this was disconnected at the inlet mani, and each end cap'd off. (make sure what ever you use is tight in there).
Although doing this, you must then in the near future fit a oil catch tank.
Hopefully this will
help solve your problems, and it wont cost you as much as it did me. Feel free to send donations
If this is the resolution, then i'd like to thank all who have helped, and both Goble and PhilW for being vey very helpful .