P0299 on Saab
Turbo/Supercharger Underboost Condition
P0299 on Saab vehicles indicates turbo/supercharger underboost condition. Au7o has documented this code across 1 Saab model — most commonly on 9-3. 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 Saab range from $1,200 to $2,500, 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 Saab by Model
Saab 9-3(1 issue)
- 9-3 B207 Turbo Bearing Failure2003-2011
The Mitsubishi TD04 turbo on 2003-2011 9-3 B207 2.0L Turbo engines develops shaft-bearing wear around 100,000-150,000 miles, especially on Aero variants which run higher boost. Symptoms: high-pitched whine, oil consumption, blue smoke under boost. Often co-fails with the bypass valve diaphragm.
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View P0299 across all makes →Frequently Asked Questions
What does P0299 mean on Saab?▼
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 Saab specifically, this code is documented across 1 model.
What causes P0299 on Saab vehicles?▼
Common causes on Saab: 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 Saab?▼
Repair costs on Saab range from $1,200 to $2,500, depending on the specific model and root cause.
Which Saab models have P0299 documented?▼
Au7o has documented P0299 on 1 Saab model: 9-3.