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p0299
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Audi · SUVs
Turbocharger/Supercharger A Underboost Condition
Quick Answer
Error code P0299 on your Audi SUVs means: Turbocharger/Supercharger A Underboost Condition. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
F3FY4M4MNGENGE
Likely Causes
  1. Boost leak in charge pipes or intercooler connections
  2. Wastegate actuator stuck open or not functioning
  3. Torn or failed diverter valve (bypass valve)
  4. Worn turbocharger bearings with excessive shaft play
  5. Restricted exhaust from a clogged catalytic converter or blocked DPF
How to Fix It
1
Pressure test the charge air system to identify boost leaks
2
Inspect intercooler hoses and charge pipes for cracks, holes, or loose clamps
3
Test the wastegate actuator for proper range of motion and vacuum hold
4
Check the diverter valve diaphragm for tears or electronic failure
5
Measure turbocharger shaft play for bearing wear and inspect for oil seepage
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
Wastegate actuator
Charge pipe clamps
Turbocharger assembly
Related Error Codes
P0171P0174P0300P0302P0420
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