P0299Toyota YarisYears: 1996 - 2026
Engine Over Boost Condition (Turbo/Supercharger)
Reviewed by ASE Certified Technician
What does this mean?
Code P0299 indicates under-boost condition from the turbocharger/supercharger.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Toyota Yaris models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Stuck or faulty turbo wastegate
Faulty turbocharger boost control actuator
Vacuum leak in intake system
Exhaust leak before oxygen sensor
Symptoms to Watch For
- Check Engine Light is illuminated
- Excessive turbo lag or no boost
- Significant loss of engine power
- Vehicle enters reduced power / limp mode