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P0299 code definition
P0299 is a generic OBD-II diagnostic trouble code indicating an underboost condition.

What the P0299 code means
The P0299 code indicates that the Turbo or Supercharger "A" has excessively low output. The ECU looks for a specific range of boost and when the low boost is detected by the ECU, it sets a P0299 code.
This code will illuminate a Check Engine Light on the dashboard and may put the vehicle in limp mode. The limp mode is to prevent further damage to the vehicle and will remain until the code is cleared or repaired.
What causes the P0299 code?
Faulty turbo or supercharger
Low oil pressure in the engine
Fault in the EGR system
Air or intake leak or restriction
Faulty boost pressure sensor
 
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