Rebuilt throttle actuators are available. But that code is a general code that covers a lot of territory. On OBDI that code is simply telling you to check the CC/ISC socket for more detailed codes. The throttle actuator is an expensive enough part to justify some further code reading, and seeing what you can get on the 38 pin connector is a good place to start. I have a vested interest in the question as I recently bought a 95 S320 which is also a 38 pin / early OBDII adopter, as is the 95 SL320.