1995 E320 - 3 trouble codes?
 

What I know: From the rectangular diagnostic connector in front of the battery using the built in LED/SW at PIN #2, I retreived the following codes.

http://www.troublecodes.net/MB/

6 - Idle speed control inoperative.
22 - Cam position sensor signal defective.
25 - Knock sensors.

Sounds like #6 could be a $1000 throttle actuator... "Regarding code number 6, your idle speed is controlled by the throttle actuator, which is a very expensive part - about $1,000. "

Any chance that the #6 code could be caused by the Cam Sensor, or the Knock sensor(s) failing?

you need to get the codes from socket 14, that will tell more of the story concerning your throttle actuator