Araam Aj Abdal

Does anyone have any ideas? I have taken off the Mass Airflow Sensor and cleaned it with contact spray, waited and put it all back together and still no change.

I'm aware, it was definitely a turbo problem.

Firstly thanks for taking the time to read! I have a 2006 Superb 2.0tDI (boo!! i know) The turbo went on it a week ago and I managed to get a remanufactured one from euro car parts for £250 (after giving them the knackered one back). I've had it put in the car however now the turbo will not activate in first or second gear and yet is fine in the rest of the gears? In first and second the revs do not go above 2,000RPM. Can anyone please advise what the problem might be? Diagnostics are not revealing anything =/ Thanks again!