Right I have a 1999 seat toledo 1.9tdi 110bhp Ahf. The problem is that the turbo is not boosting right. I discovered this when fitting a staright pipe and the tubo does not make the coo noise(turbo spool). I have replced the boost sensor(Map sensor), air flow metre (Maf sensor), I have checked the n75 and n18 valve using autocom cdp pro and the solenoids are working and ticking. But my problem still exists and when driving there is no pull on the car, i think i am in limp mode and it feels like the power is been cut when putting the shoe down. When i flick the ignition, power comes back, the car starts boosting and cooing but then cuts in a high gear when it seem's to get under pressure when its seem's to be boosting right????? I have checked the vacum lines but not extensively! Also when reving and holding the intercooler pipe it does not build pressure or swell in any way. so no boost coming through! Please tell me the answer? Could it be the actuator? Vanes? Turbo?? Ecu??