I have;
17964/P1556/005462
1 17964/P1556 - Charge Pressure Control: Negative Deviation
1.1 Possible Symptoms
1.2 Possible Causes
1.3 Possible Solutions
17964/P1556 - Charge Pressure Control: Negative Deviation
Possible Symptoms
Reduced power output
Limp mode
Possible Causes
Boost Pressure too Low
Hoses/Pipes incorrect connected, disconnected or leaking
Charger Pressure Control defective
VNT (variable nozzle turbo): nozzles stuck
Solenoid Valve for Boost Pressure Control (N75) defective
Possible Solutions
Check Hoses/Pipes to/between Components
Check Solenoid Valve for Boost Pressure Control (N75)
Check / Clean / Replace Charge Pressure Control
Check / Clean mechanism for variable nozzles
This is from Ross-Tech Wiki HTH
Regards Mark
Modern cars, Its all wizardry and witchcraft
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