My Engine Management Light has started coming on under acceleration (about 3000 revs in 2nd gear), goes out for a while, only to re-appear a few days later. An engine check has diagnosed the following error codes: 

 

18263 P1855 and 17964 P1556.

 

Anyone know anything about these, what they affect, how serious they are,  and what can be done ?

 

Thanks

 

mbp

there's stacks on vag-com  site it's VCDS ?now I think

Google "Ross Tech Wiki" and all shall be revealed.

Sent from my Nexus 4 using Tapatalk 2

Copied from ross tech wiki > LINK

 

Couldn't find the first code

 

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

 

Could be time for the mr muscle treatment

 

Edit: just googled 18263 P1855, have you disconnected the battery?

18263  P1855 as said above if iu disconnected battery nothing to worry about it might not reset tho read on forum