I have a late 1996 R129 SL600. Recently the use of kickdown has resulted in the immediate trigger of Limp Mode and illumination of the BAS/ESP orange light. Restarting the engine clears the symptoms until kickdown is tried again. If kickdown is not used the car drives perfectly, with no issues whatsoever. It will cycle up and down through the gears with no problems at all. It is solely attempted kickdown that immediately triggers the problem. I have Carsoft diagnostics and the following codes are present (code descriptions take from Actron.com): P0150 - O2 sensor circuit malfunction P0818 - Driveline disconnect switch circuit P0006 - Fuel shutoff Valve A control circuit P042A - Cat temp sensor circuit P007B - Charge air cooler temp sensor circuit (BUT CAR IS NOT TURBOCHARGED!) P2801 - transmission range sensor B circuit Other info: - The two O2 sensors are brand new. They were the first thing I replaced. - The ATF level is correct - The pilot bush is dry and corrosion free Grateful for any advice. On typing this up I notice the word "circuit" is present in every error code description - is the conductor plate worth looking at? Also, the battery seems fine and is always on a CTEK charger when not used but maybe worth bunging in a new battery? Thanks.