p0234
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Audi · Sedans
Turbocharger/Supercharger A Overboost Condition
Quick Answer
Error code P0234 on your Audi Sedans means: Turbocharger/Supercharger A Overboost Condition. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Read actual versus requested boost pressure values with a diagnostic scan tool
2
Inspect the N75 boost control solenoid and vacuum lines for proper operation
3
Test the wastegate actuator for free movement and proper holding pressure
4
Check the boost pressure sensor for accurate readings compared to a known gauge
5
If the wastegate is mechanically seized, replace the turbocharger or wastegate assembly
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
N75 boost control solenoid
Wastegate actuator
Boost pressure sensor
Wastegate vacuum lines
Turbocharger assembly
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