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Home >> Pontiac >> 2003 >> Aztek FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0401: EGR System - Insufficient Flow >> Test Description
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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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