p0299
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Audi · Sedans
Turbocharger/Supercharger A Underboost Condition
Quick Answer
Error code P0299 on your Audi Sedans means: Turbocharger/Supercharger A Underboost Condition. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Perform a boost leak test by pressurizing the intake system
2
Inspect all intercooler hoses and charge pipes for cracks or loose clamps
3
Test the turbocharger wastegate actuator for proper movement and holding pressure
4
Check the diverter valve for tears in the diaphragm or electronic failure
5
Measure turbocharger shaft play and inspect for oil leaks indicating bearing wear
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Intercooler hoses
Diverter valve
Turbocharger wastegate actuator
Charge pipe clamps
Turbocharger assembly
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