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Home >> Chevrolet >> 2000 >> Impala LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0401: EGR Flow Insufficient >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2

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