"2010" F10 525d
Any advice please?
The problem is sometimes and "getting more often" the tone of the exhaust changes, the best way to explain it is instead of a purr it humms and then I get smoke out of the bonnet and into the car and the smell of burning oil.
I've had my mechanic put it on diagnoses this is not a "BMW mechanic" so not BMW computer but the fault says...
279100H/2593024 Undocumented Code.
253400 - Swirl flap actuator, position control, swirl flaps closed too far/positive control deviation.
It appears my car has an N57 engine so don't have swirl flaps but has in-line flaps is this right?
If the above is correct would this cause the symptom's described? and what is the solution?
Thanks in advance