http://www.google.co.uk/url?sa=t&rct=j&q=p2112%20fault%20code&source=web&cd=2&ved=0CA4QFjAB&url=http%3A%2F%2Fforums.tdiclub.com%2Fshowthread.php%3Ft%3D321641&ei=bocLVKfuCcXdOdv_gfAI&usg=AFQjCNE5LDWYuEZg9X-2vit2VEUDmF1y6A
Looks like you'll need to replace the throttle valve/anti-shudder valve, or at least take it off for cleaning, from what I've just read this fault can stop DPF regeneration, so beware of excess soot build up before having it fixed
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