If i drive my 2001 e55 normal it will run and shift fine. Full throttle without hitting the kickdown switch and it pulls good but does not kick down. Soon as i hit the kick down switch at full throttle the car goes into limp mode. It will sometimes give me a check engine, code P0120. Is this the throttle sensor under the hood? or a bad kick down switch after the peddle? It will also do this in park, Doing the same process as above^. Hopefully my fellow enthusiast can help me.