[hwads]

Hi and thanks for taking the time to read my post,

I recently bought a 2011 320d ED with 100k on the clock, with a part dealer full history.

The problem, The half filled in yellow engine light appears when i get to about 2500/3000 rpm in 3rd gear onwards (hasn't happened in 2nd) the light comes on stays on briefly then disappears,
it does appear to loose a little power not limp mode then once the lights out its back to normal although i do back off the revs a bit. if i drive gently it will go past the 2500/3000 rpm ok no issues.
Had it checked at my local garage (not dealer) and here's the codes.

4755 Boost pressure actuator position control
4521 charge air pressure control small turbo control deviation
4D96 exhaust gas pressure sensor before turbocharger range
4752 boost pressure actuator position control

Any ideas as to what I need to replace, clean or fix.

Thanks