1994 c280.
Dealer replaced the crank sensor. When I drove in it shifted fine. When I drove out it shifted hard. The shifts are so harsh you think it is going to break something.
Research said a vacuum line is probably disconnected.
Diagnosis by said dealer: It is the Oxygen sensor -- no vac lines loose.
Now, maybe I'm missing the boat here -- but:
1. How does an O2 sensor cause this?
2. How did that mysteriously start at the time of that repair?
3. By the way, the duovalve also went out about 3 days after this repair.
Something fishy here. Thoughts?
