P0299 on Citroen
Turbo/Supercharger Underboost Condition
P0299 on Citroen vehicles indicates turbo/supercharger underboost condition. Au7o has documented this code across 1 Citroen model — most commonly on DS3. 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 Citroen 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 Citroen by Model
Citroen DS3(1 issue)
- Turbocharger Oil Leak2010-2019
The DS3 THP turbocharger develops oil leaks from the oil feed and return pipes, and the turbo bearing seals degrade over time. Oil consumption increases and blue smoke is visible under boost and on the overrun.
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View P0299 across all makes →Frequently Asked Questions
What does P0299 mean on Citroen?▼
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 Citroen specifically, this code is documented across 1 model.
What causes P0299 on Citroen vehicles?▼
Common causes on Citroen: 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 Citroen?▼
Repair costs on Citroen range from $400 to $1,500, depending on the specific model and root cause.
Which Citroen models have P0299 documented?▼
Au7o has documented P0299 on 1 Citroen model: DS3.