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Hello there - first, is your '03 MINI a Cooper or a Cooper S?
P1226 Throttle - malfunction (flap malfunction)
P1125 Throttle - valve potentiometers 1 and 2 - measuring-range or power-output problem
When you got the EML light you only were throwing P1125? P1126 is not present at this time?
I have seen these items below replaced before for these 2 codes/issues:
13-54-7-509-043 Throttle Housing AS
12-51-7-520-939 Wiring Harness
Since you already replaced the throttle housing, it may or may not be related to the harness. You'll want to dive into that problem area a little more and see if it is possible that it's your cause.
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