Code
P0299
Boost
Turbocharger underboost condition
The engine is not reaching the commanded boost pressure.
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Most likely causes
- Boost leak (hoses, intercooler)
- Wastegate stuck open
- Restricted exhaust (catalyst/DPF)
- Weak turbocharger
Symptoms you may notice
- Check engine light
- Lack of power
- Whistling noise
Checks to run
- Pressure-test the intake system
- Check the wastegate
- Check boost live data
- Check for exhaust restriction
Tools you may need
Boost leak tester
OBD-II scanner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.