p0299
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Peugeot · Sedans & Hatchbacks
Turbocharger/Supercharger Underboost Condition
Quick Answer
Error code P0299 on your Peugeot Sedans & Hatchbacks means: Turbocharger/Supercharger Underboost Condition. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Check turbocharger boost pressure at idle and load
2
Inspect all boost hoses for leaks or cracks
3
Test wastegate actuator operation
4
Check engine oil level and condition
5
Perform smoke test on intake system
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Turbocharger
Boost hoses
Wastegate actuator
Engine oil and filter
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