Unfortunately, CC ID 29 is a generic "Hey, there's a problem", so there's a limit to what kind of advice you can get from a distance.
I can't speak with certainty about a 2006, but if it were a 2009, a yellow MIL would indicate you are in "limp" mode, with engine output restricted. I would think a diagnostic visit to the dealer would be warranted if you don't have the means to pull the detailed codes yourself.
Yellow lets you drive to the dealer or indy and get it checked. If it were red, you would want to stop driving the car.
2009 335i xDrive coupe, Jet Black, Black Leather, Grey Poplar, Steptronic, ZPP, ZSP, ZCW, iPod/USB, HD radio, Parking Assist. Rear Fogs, Hardwire V1, ProFit G3.
ED 5/12/09, Munich dropoff 5/16/09, Redelivery 6/22/09, Sold 3/8/15
Prior 40 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion / 2009 BMW 335i xDrive E92
Last edited by Zooks527; 02-13-2013 at 05:46 AM.