The vacuum pump of my 2009 MCS is leaking oil. I purchased a vacuum pump O-ring to reseal the pump I have not replaced the O-ring yet. Yesterday, a got a misfire and 4 error codes: P0503 Speed Sensor, P1497 Downstream Throttle Air Leak, P0303 Misfire Cylinder 3 and P0300 Combustion Misfires Several Cylinders. It is possible that the code P0503 Speed Sensor and P1497 Downstream Throttle Air Leak could be caused by the vacuum pump? The car has other issues.
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MINI Cooper R56 Vacuum Pump Replacement (2007-2011) | Pelican Parts DIY Maintenance Article