P0299 on Ford Focus
Turbocharger/Supercharger A Underboost Condition
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Ford Focus context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P0299.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P0299 Means on Your Ford Focus
P0299 is a diagnostic trouble code indicating: Turbocharger/Supercharger A Underboost Condition. This code relates to the fuel injection system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real Ford Focus Owner Reports
Source: NHTSA Complaints Database
"This is the second time this car gets a p0299 failure. i was on the freeway, trying to speed up, when the engine revved up quickly, but did not change gear. instead, the car started slowing down. after a few seconds, the car started speeding up at a sluggish rate."
"I bought this car a few months ago with no problems from a used car dealership in Kentucky. A few days later the check engine light came on and the turbo was not working."
"I bought a brand new 2017 ford focus and have had it in the shop 6 times for an error code of p0299 turbo/super charger underbooster going off. the engine is losing power when it starts acting up and to protect the car it shuts down the underbooster."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Ford Focus
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.