ave noticed this over the last few days, and was hoping for a bit of guidance.

Basically the car has lost power, and is in semi limp mode (won't rev over 2k, but does accelerate) and no kickdown.

There is a distinct whistle when accelerating, which has become more distinct over the last while.

I have changed the MAF, in June to be exact, so I am happy it is ok.

Are there any pipes, bar the turbo intake, which I should be looking at, as I am assuming it is an air leak? ?

2004 C270 cdi

After checking a few pipes today, and then going for a quick run I got an EML, P0034, which cleared immediately when I used my ELM327 scanner