VCDS Fault code deciphering AHU TDI

[hotpod]

I know why the vehicle speed signal is wrong and what I need to fix it but the ECU memory error is troubling and can anyone tell me what the intermittent control difference in the intake manifold pressure could be? I thought I knew that one, as my U bend pipe from turbo to manifold ( I have no intercooler and have yet to fit a chargecooler) had a glued in plastic boss for the temp sensor which was cut off the golf pipe and was always a bit oily so I presume was leaking under boost. I now have changed it for a screw in sensor and there are no leaks. So what to check next?