C220 driving me insane need help

Shanemcb

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Hi guys, new to the forum and not a car guru by any means.
Took my 2012 C220 sport to the mechanics a month ago, told DPF needed regenerated/pressure brought down, this didn’t work as pressure came back up, was also getting intake leak error codes.

Car is not boosting as it should when I drive on the motorway, which then forces it back into limp mode and engine light comes back on.

Long story short, have had DPF sensor replaced, Boost sensor replaced and Inlet manifold replaced (previous one had cracked and seized), they carried out a smoke test and can’t see any holes.

What else could be causing this issue after all that’s been replaced?
Just seems to be never ending, I’m not sure if I should take the car elsewhere but then have to start all over again and already out £900

Thanks for any help,
Shane
 
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