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Home >> Saturn >> 2001 >> SC2 Automatic, MP7 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0401: EGR Flow Insufficient >> Diagnostic Aids
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Diagnostic Aids

Verify MAP sensor reads correctly at idle (1-1.5 volts). If MAP sensor is skewed or faulty, DTC may set.

DTC can be set by carbon build-up around EGR valve or blocked EGR passage. Remove EGR to clean pintle valve or passages. Replace EGR valve is necessary.

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