P0299 on Peugeot
Turbo/Supercharger Underboost Condition
P0299 on Peugeot vehicles indicates turbo/supercharger underboost condition. Au7o has documented this code across 2 Peugeot models — most commonly on 207, RCZ. P0299 means the engine computer detected an underboost condition — the turbocharger or supercharger is producing less boost pressure than the PCM expects for the given conditions. The computer compares the manifold/boost pressure sensor reading to a target based on engine load, and when actual boost falls short, it sets this code. The most common real-world cause is a leak somewhere in the intake/charge-air path. You'll typically feel reduced power or sluggish acceleration, and the engine may go into a reduced-power mode. Typical repair costs on Peugeot range from $400 to $1,500, depending on the specific model and root cause.
Common Causes of P0299
- •Boost/intake leak (cracked or loose charge-air hose or intercooler)
- •Faulty or sticking turbo wastegate or actuator
- •Stuck or clogged variable-geometry turbo vanes (VGT)
- •Faulty boost pressure or MAP sensor
- •Leaking or disconnected vacuum/boost control lines
- •Restricted air intake or clogged air filter
- •Failed boost control solenoid
- •Worn or failing turbocharger
P0299 on Peugeot by Model
Peugeot 207(1 issue)
- Turbocharger Oil Leak2006-2014
The turbocharger oil feed and return lines develop leaks on the 1.6 THP engine, leading to oil consumption and blue exhaust smoke. The turbo bearing seals also deteriorate with extended oil change intervals.
Peugeot RCZ(1 issue)
- Turbocharger Oil Leak2010-2015
The THP turbocharger develops oil leaks from the feed and return lines, and the turbo bearing seals degrade with heat cycling. Oil consumption increases progressively, and blue smoke appears under boost.
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View P0299 across all makes →Frequently Asked Questions
What does P0299 mean on Peugeot?▼
P0299 stands for "Turbo/Supercharger Underboost Condition." P0299 means the engine computer detected an underboost condition — the turbocharger or supercharger is producing less boost pressure than the PCM expects for the given conditions. The computer compares the manifold/boost pressure sensor reading to a target based on engine load, and when actual boost falls short, it sets this code. The most common real-world cause is a leak somewhere in the intake/charge-air path. You'll typically feel reduced power or sluggish acceleration, and the engine may go into a reduced-power mode. On Peugeot specifically, this code is documented across 2 models.
What causes P0299 on Peugeot vehicles?▼
Common causes on Peugeot: Boost/intake leak (cracked or loose charge-air hose or intercooler), Faulty or sticking turbo wastegate or actuator, Stuck or clogged variable-geometry turbo vanes (VGT), Faulty boost pressure or MAP sensor, Leaking or disconnected vacuum/boost control lines. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0299 on a Peugeot?▼
Repair costs on Peugeot range from $400 to $1,500, depending on the specific model and root cause.
Which Peugeot models have P0299 documented?▼
Au7o has documented P0299 on 2 Peugeot models: 207, RCZ.