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Home >> Buick >> 2003 >> Regal LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0401: EGR System Insufficient Flow >> Test Description

Test Description

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

  1. 2

    MAP sensor faults must e diagnosed first. A skewed MAP sensor reading could cause this DTC to set.
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