I have a CEL intermittently for a few weeks and the dealer says they can't replicate it. I'll have the thermostat checked next time I am in. I am around 15k miles and all stock.
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18