Mercedes c220 cdi w204 2010 p0101 code

[Festamb1]

Hi I need help please I have a p0101 code on my car which is now in limp mode so I brought a replacement mag sensor and it’s still going straight in to code the live data says the mag is on 0.02 - 0.09 when at high revs has anybody got any ideas once I reset the code it started to drive nice with the turbo working then it goes in to limp mode straight away
My car is a 2010 w204 c220 cdi c class
Many thanks
Mark

 

[mersum1es]

whats p01209238734 ?

Car info is good, props for that!

Edit: if it is boost pressure related, check all boost charge lines (sometimes split is difficult to spot), conditin of cooler. Is turbo actuator moving when revving? Are boost pressure sensor and other pressure sensors giving SAME reading at engine stop?

if mag = MAF (mass air flow sensor), check wires are ok, no pin withdraw etc.

 

[Festamb1]

Hi when changing the maf sensor as I have done will this needs coding in or should work straight away
whats p01209238734 I don’t understand what you mean by this
Many thanks
Mark