Hi all I have a A4 1.9 tdi 130 sport 2004 155k. Having problems accelerating when hitting around 3500 rpm in 3rd and 4th the car goes into limp mode and engine light comes on. Connected a obd reader and code P0234 has popped up. Since then I have checked most of the hoses, cleaned the egr valve and pipe. Also checked to see if the turbo was sticking by moving the actuator arm there seems to be a bit of resistance so for good measure performed a mr muscle clean. After taking it for a spin still getting the same P0234 code. After researching other possible reasons could be the boost pressure sensor or the n75 valve or possibly the maf sensor. Has anyone else had the same problem or shed some mechanical knowledge on it.
