Underboost is a condition that can be caused by several issues including:
- Bad TCV
- Bad Turbocharger
- Failed boost sensor (for models that have them)
- ECU seeing overboost and cutting back until reset and condition remedied
- Failed MAF (for ecu’s that use the MAF to determine boost pressure)
- Failed atmospheric sensor ( again for those that use it)
Less boost after wastegate adjustment
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