My 3.5d is at the dealer for the 3rd time with the check engine light coming on and staying on (8400 miles). They asked to keep it a couple of days (with loaner). The last time the system showed Fault 4C52-Charge Air Temp Plausibility and 4B82-EGR Deviation. There were no failures present and the car runs fine. Each time this has occurred has been when the car is started first thing in the morning. My service rep seemed to think that back in January there was a discussion among BMW service personnel about this and that it was a software issue. I will post when I get the car back to see if there is a resolution.