2022 230i - unpleasant rattling noise when engine starts up

raffael.rutherfordhu · Post by **raffael.rutherfordhu** » Fri Jun 19, 2026

Hi there,

Just this morning, upon starting the vehicle—which I had purchased a few weeks ago from a main dealer in the UK—I detected the aforementioned rough noise, which sounded like a terrible diesel rattle. After about 45 seconds, it fades away.
Later this morning, I went to the parking lot at my workplace to take a look, and sure enough, the same thing happened: an annoying rattle for about 45 seconds, followed by normal idling.

Does anyone have a clue as to what this problem could be?

I am grateful.

dorian_enriquezq · Post by **dorian_enriquezq** » Fri Jun 19, 2026

I would return to the dealer armed with it, even though I am unsure of its nature.

ignacio_stanhopez · Post by **ignacio_stanhopez** » Fri Jun 19, 2026

Does the wastegate jingle when the engine is cold started?

dorian_enriquezq · Post by **dorian_enriquezq** » Fri Jun 19, 2026

I didn't consider that, haha.

crispin_couturierz · Post by **crispin_couturierz** » Fri Jun 19, 2026

perhaps a hanger or a heat shield.