Today I tried to log Actual vs requested boost,with engine speed (red) and duty cycle with vcds.
Its a BRE 16v 2.0tdi.
This is the multitronic gearbox with the 7speed, so the idea was to go from 2000rpm - max, without hitting the kickdown, but it was in 4th, and went to 5th, and then hit limp mode, with a P0234 overboost code again.
I tried 3or4 times, after clearing the code, and this is the graph I got.
I have cleaned the turbo with mr muscle, replaced the N75, and had a good xmas day run for about 20+miles at 3500-4000rpm in 4th gear with no problems, so was surprised it went in limp mode today
Does this graph show anything unusual?
Screenshot_20221227_174541.jpg