The code which is coming up is p1556 any one now what the problem could be also now and again car goes in limp mode

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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
  

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Cheers for that mate its had a other n75 valve on but never had codes clear it wouldn't still do it would it

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Sorry forgot to mention ther turbo laggy to about 2500rpm to 3000rpm

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It sounds like either sticky turbo veins, boost leak, faulty vacuum connection/controller.

Check all the vacuum connections, all boost pipes and try giving the turbo actuator a push (it will be pretty stiff anyway but should have some movement to it).

Phil

I'm having the same problem currently :( glad of this thread... Will give it a try

J.E