p0234
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Audi · SUVs
Turbocharger/Supercharger A Overboost Condition
Quick Answer
Error code P0234 on your Audi SUVs 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
Compare actual boost pressure to requested boost pressure using a scan tool
2
Inspect the N75 solenoid and its vacuum/pressure lines for blockages or leaks
3
Test wastegate actuator movement and confirm it holds vacuum properly
4
Verify boost pressure sensor accuracy against a mechanical boost gauge
5
Replace the wastegate actuator or turbocharger assembly if the wastegate is seized
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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