P1631 0x28BD/0x2B22 Throttle Valve Actuator Spring Test
Your throttle body could potential be on its way out. I've seen many individuals with this code that replaced the TB and it resolved their issue.
TB replacement and info here:
MINI Cooper R56 Throttle Housing Replacement (2007-2011) | Pelican Parts DIY Maintenance Article
New TB, if needed, here:
2007 Mini Cooper S Hatchback - Intake System - Page 2