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Home >> Buick >> 2003 >> Century Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> DTC P0401: EGR Flow Insufficient >> Test Description

Test Description

The number below refers to the step number in the diagnostic procedure.

  1. 2  - MAP sensor faults must be diagnosed first. A skewed MAP sensor reading could cause this DTC to set.

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