power problem audi a4
 

please help!!!
first off im getting 2 codes
17965 charge pressure control
engine mount solnoid [not sure of code,will know 2moro]

my car is an 01 A4 1.9tdi[red I] 130bhp SE and has always had serious power,the turbo always kicked in the minute i pressed the accelerator,,but since i had the fault codes,the turbo doesnt kick in till 2500-3000 RPM,,an when i get to 60 or 70 MPH the car just loses all power an goes into LIMP MODE,
anyway
[pls bear with me this is my 1st post an just trying to explain the best i can]
my m8 has a 02 1.9 tdi[normal I] so i swaped sensors with him an it turned out that,,
it was the TURBO BOOST sensor,,now the turbo kicks in at 1500RPMs an doesnt go into LIMP MODE,so i taught i had it fixed but now my problem is,,
its no where near as fast,,the turbo kicks in right and no limp mode,,
but it just feels like there not enough turbo or im after losing horse power????

does anyone have any ideas?? i would be really grateful if there is any

maybe change the N75 valve????

these forums have been unbelieveable help with everything,,but this one is just really getting to me,,,

any replys wud be helpful

thank you very much
gerry

Start with a boost leak test.

how do i do tat,, an how do i know what pressure it should be??

sorry but im new to this,,
thanks for your reply