E270cdi limp mode

Hi my 2005 e270 has a recurring problem going into limp mode after accelerating/kick down to pull out to overtake. When switch the engine off and on the problem clears, the roads I drive daily rarely sees revs above 2000 and 60 mph.

Managed to get a local garage to read the faults (not on star)

2359-2 check charge air system. Boost pressure too high
0105-1 check component stored B5/1 (charge pressure sensor). Charge pressure is too high.

Is this a faulty pressure sensor or something else, where is it located so I can check/replace

Thanks