The 335i xDrive came out in 2007.
2012 was the first year of the F30 version, with the first cars arriving in February, 2012. E90 series sedan production was discontinued in October, 2011 (coupe production continued for the 2012 and 2013 models). F30 series xDrive production began in July, 2012. It's likely that with the very short production year, no 2012 xDrive sedans were made (Edmunds has no listing for a 335 xDrive sedan in the 2012 model year, so it looks like they were run as 2013 models).
You can likely get better information in the F30 forum than here in the E90 one.
2015 M235xi coupe, Black Sapphire Metallic, Black Leather, Fineline Stream trim, Steptronic, xDrive, ZPP, ZTP, ZCW, ZDA, ZDB, 5DP, hk w/ BimmerTech amp, Enh. BT
Ordered 3/12/15, Off the line 4/7/15, Delivered 5/14/15
Prior 40 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette / 1981 Subaru GL wagon 4WD / 1983 s10 Blazer 4x4 / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion / 2009 BMW 335i xDrive E92
Last edited by Zooks527; 09-12-2013 at 06:46 AM.