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      11-09-2012, 03:10 PM   #9
peeti
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Drives: 2011 M3 e90
Join Date: Apr 2012
Location: Chicagoland

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Yep leaking injectors. Just had ours replaced on the 335i - symptom was tied to cold days, cold engine. Once it warmed up all was good - for a while. After a month of putting up with it, we'd get CEL or limp mode. Eventually enough rich exhaust went downstream it clogged up one cat and that exploded down-stream trashing the exhaust with honeycomb material.

Only way to check the injectors, I believe, is to bench test them and new ones are not cheap. Good luck!