Tony Bickers
Quick Google search found this,
HTH
3ff0 air-mass flow sensor
ratio of calculated to measured air mass too high
fault currently not present
fault would cause a warning lamp to light up
sae diagnostic trouble code p3263
Message Thread 
BMW X3 2005 - Fault code 6368 undocumented code & P3263 # - Chris Pool December 1, 2009, 11:44 pm
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on December 2, 2009, 12:59 pm, in reply to "