passatTDIawx
New member
i have a 2001 vw passat 1.9 tdi (engine code awx)which has a lack of power until about 3000 rpm when the turbo eventually cuts in for a little while normally in forth or fith the turbo will cut out, there is a fault code in the ecu P1557 - turbo charger - boost limit exeeded, i have checked the actuater rod moves freely and i have used the innotec turbo cleaner no change i checked the vacum pipes from the actuator to the n75 solenoid, i have cleaned both the n75 solenoid and the m/a/p sensor no change, on the diagnostics the boost values are correct readin about 1.2 bar at 3900 rpm. could it be that m/a/p sensor or n75 solenoid. if any body could help that would be much appreciated