BMW M Sport Enigma

[jameswright77]

Esteemed Colleagues
I own a 2007 BMW M Sport 325, unleaded, automatic, equipped with an all-electric sunroof, and it has just 74,000 km. The enigma is in the fact that no one can ascertain the issue; I became exasperated with spending expenses for uncertain diagnoses. Subsequently, I entrusted it to a BMW dealership in Southport, UK, for three months—resulting in no resolution. “They are unaware.” I retrieved the vehicle, which operates well despite emitting smoke from the exhaust. I would want to ascertain the underlying issue and maybe arrange for repairs at a fair cost, as well as get a MOT certificate. I have reached out to BMW UK, but they have said they are unable to assist. Is anybody able to? It is really disheartening.Thank you.

[KARlosfuentes]

What is the colour of smoke?
What actions have been taken about it so far?
Is it N52 or N53?

[jameswright77]

White smoke - I believe it is N52 - thank you.

[KARlosfuentes]

Have they conducted a block test?

[jameswright77]

Likely not; they did not even deactivate the dashboard lights, and the Engine Management Light remains on.

[KARlosfuentes]

Commence again with a someone who can conduct a diagnostic scan to ascertain the reason for the illuminated lights. Given the presence of white smoke, do a block test and proceed accordingly.

[jameswright77]

Thank you.

[jameswright77]