SKODA OCTAVIA 1.4 TSI PROBLEM

[kospoz]

Hi guys i have this car with engine fault p0234 overboost condition.The diesel motor has turbo with variable vanes and when we had same fault the vanes was sticky.This motor has turbo without variable vanes only one pipe.Can this pipe stuck or the problem is from some valve?

[ruffles1986]

Hi guys i have this car with engine fault p0234 overboost condition.The diesel motor has turbo with variable vanes and when we had same fault the vanes was sticky.This motor has turbo without variable vanes only one pipe.Can this pipe stuck or the problem is from some valve?
Check for leaks in vacum pipes

[Keithuk]

VAG Error Code: 16618/000564
EOBD II Error Code: P0234

Fault Location:
Turbocharger/Supercharger Boost Pressure -
Regulation Limit Exceeded (Overboost Condition)

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Boost Pressure too high.
Reduced Power Output.

Hoses incorrectly connected, disconnected, blocked or leaking.
Solenoid Valve for Boost Pressure Control (N75) faulty.
Boost Pressure Sensor (G13) faulty.
Turbocharger stuck/faulty.

Possible Solutions:
Check Charge Pressure Control System.
Read Measuring Value Blocks (MVB).
Perform Output Test (to check the Turbocharger).
Perform Basic Setting (to check the Charge Pressure Control).
Difference of set value boost pressure vs. altitude sensor signal > 200 - 1275 hPa.
Perform Pressure Test to locate Leaks.
Check/Replace Solenoid Valve for Boost Pressure Control (N75).
Check/Replace Boost Pressure Sensor (G13).
Check/Replace Turbocharger.

Description:
The boost pressure sensor responds to pressure changes in the intake manifold. This pressure is created by the turbocharger and changes with accelerator pedal position (APP) and engine speed. The Engine Control Module (ECM) uses this information to assist in diagnosis of the barometric pressure (BARO) sensor and to provide engine overboost protection. The boost pressure sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The Engine Control Module (ECM) supplies 5 volts to the boost pressure sensor on the 5-volt reference 2 circuit, and provides a ground on a low reference circuit. The boost pressure sensor provides a signal to the Engine Control Module (ECM) on a signal circuit relative to the pressure changes. The Engine Control Module (ECM) monitors the boost pressure sensor signal for voltage outside of the normal range. The Engine Control Module (ECM) calculates a predicted value for the boost pressure sensor. The Engine Control Module (ECM) then compares the predicted value to the actual signal.

As taken from my EOBD II Fault Codes software which you can Google.