Join the club. Mine is acting up again. Same thing, ASR comes on, limp home mode. Happens mostly on the highway. Took it to the dealer, said I need new tires cause there is a vibration in it disturbing the sensor. That is a crock of $hit cause they are 4 brand new continetals that run as smooth as a babys behind. They just dont know and needed a diagnosis to charge me $85.00. I think I might have a actuator going bad perhaps or bad wiring somewhere.
Im about to bypassing this electronic throttle bull $hit all together. This has been a never ending problem with this car, and has run me into some serious money.
Either way, Tom, be prepared to spend a lot of money and have your patience tried.
93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K