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I'd check but my car is back in the hands of BMW for 2-3 months.
While on my ED at the 'ring I used an android app called "Torque" to record telemetry data from the X1's on board diagnostics port. The app is free or $5 for the full version and you can buy a bluetooth OBD adapter for $15-$60 that will probably shed some light on this for you. There are about 50 things you can monitor through the ODB port of an X1 including the accelerator pedal position, the requested power level, the actual power level that the engine is outputting, the requested and actual power level and dozens of other useful stats that will help you figure out if DTC is really cutting your power.
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