Quote:
Originally Posted by
jay_bob 
Pull the triangle resonance pod off (3 bolts, pull up) to get a lot better view of the back of the mixing chamber.
Quote:
Originally Posted by ROLLGUY
I did just that, and no sensor in the back of the mixing chamber. There has to be something else leaking boost.
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I had another look at this today. I removed the snap ring from the turbo actuator so I could manually give it boost while a friend revved up the engine. Sure enough, there was a huge boost leak around the boost hose connection to the mixing chamber. I removed the air intake hose to get a better look, and you guessed it- the temp sensor was behind dangling by the wire. I plugged it back in, and now the car drives like a greased cheetah chasing a bullet train (well not quite, but close). Evidently this engine is a little different than the E class, in that the sensor is not inside the mixing chamber and can be seen by removing the resonance pod. It seems that I did not have to replace the boost sensor, or clean the DPF after all. Thanks jay_bob for leading me in the right direction.....Rich