2003 E500 Whining Noise
I saw this note on the net:
MBUSA DTB P-B-13.22/01 NOV06 - All passenger models equipped with engine M272 or M273, Whining / High pitch whistle noise coming from front of engine
Faulty upper idler pulley, replace with new unit: Tightener Pulley, part # A272 202 08 19



