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P0299

Turbocharger/Supercharger Underboost Condition

System
Forced induction
Component
Turbocharger system

Symptoms

  • Noticeable loss of power
  • Check engine light under boost

Common causes

  • Boost leak / split intercooler pipe
  • Failing wastegate actuator
  • Clogged air filter

Guides for this code

bmw
Diagnostics & Repair

BMW N20 P0299: why your 328i throws an underboost code, and what to check first

Nomicore Editorial Team · Sep 21, 2026

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