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In a word, emissions. Search for DPF, SCR and EGR (collectively referred to as the alphabet soup).
a quick rundown of the other issues people have (anecdotal):
- MAF sensor
- nox sensors
- boost leaks, usually at the seals of the red charge pipe
- vacuum hoses
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2011 335d Deep Sea Blue on Beige (stock except for the cheap ass wheels from PO)
2010 328i Tasman Green on Saddle (stock)
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