Two problems related to gas recirculation valve (egr valve) have been reported for the 2005 Mercedes Benz E320. The most recently reported issues are listed below.
Vehicle was acting normally up to incident. Entering highway accelerating like normal and pulled out in front of tractor trailer when suddenly car had dramatic and frightening loss of power. Full throttle did nothing. Downshifting did nothing. With truck horns blaring and near collision, I pulled off the road. Restarting cleared the problem. Dramatic loss of power has occurred three more times with no warning nor check engine light. Now light comes on with egr out of range code. Discussing this with other mercedes diesel owners points towards soot clogged egr valve and soot clogged intake manifold. How such a problem could occur so frequently at such a low mileage with a company known for diesels is unknown.
Was driving on the highway and the car lost power. Took it in to the dealer and I was told that the problem cannot be duplicated. The car was in several times for repairs without success. Changed the egr valve to no avail. When the car looses power I have to restart it ,and then is fine for a while. Bought the car new an sill have it.