The clutch solenoid is part # 240-270-17-00.

I suspect it may be the culprit. It is not difficult to replace with transmission in situ. However, it could also be the torque converter which affects the solenoid power consumption resulting in OBD code 740. I reset the code and car drives perfectly, it drove great with the code also. The conductor plate was replaced 60k ago. I will keep an eye on the code before I do anything. I hope it is an one off occurrence and nothing serious. I just wonder any forum members have any experience with this code. Thanks.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.