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After a bit of advice on my 530d sport 2005 with just under 100 thousand on the clock. Basically I was on a motorway slip road and went to accelerate to pass a lorry and the vehicle had no power the auto gear box did not drop down and the car picked speed very slowly! The revs climbed slightly where they just sit even with foot flat to floor and the car slightly bogs down! Called the aa out and there diagnostics came back with the code p3263 any ideas what this is?
 

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That's not a proper BMW Code, you need a decent Code reader for these. Either a odb cable and a laptop running INPA/DIS or a C110 Scanner

Google suggests your code seems to be related to stuck swirl flaps. For sure if they are stuck closed you will lose a lot of power.

If you still have them fitted, get them out sharpish. If they are stuck, one or more might snap off... you'll face an £8k repair bill.
 
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