P0299 on Saab: How to Diagnose & Fix
Turbo/Supercharger Underboost Condition
1 Saab model · 1 documented issue · 1 critical · $1,200-$2,500 repair
P0299 on Saab by model: symptoms, diagnosis and fix
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.
Common Symptoms
- turbo whine
- reduced boost
- blue smoke under acceleration
- oil consumption
How to Fix
Replacement turbo ($400-$800 reman, $800-$1,400 OEM new) plus oil-feed line ($50-$80) and gaskets. Total job ~$1,200-$2,000 at independent. Always replace the oil-feed line — old line is the most common reason a fresh turbo fails immediately. Bypass valve ($40-$80) at the same time.
P0299 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0299 mean on a 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 it is documented across 1 model: 9-3.
What are the most common causes of P0299?
The most common causes of P0299 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0299 on a Saab?
Published repair estimates on Saab range from $1,200 to $2,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0299 on a different make?
View P0299 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.