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Home >> Suzuki >> 2002 >> XL-7 Plus >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0401 Or DTC P0402 >> Possible Causes

Possible Causes

Possible causes are:

EGR valve malfunction.
EGR passage restricted.
Manifold Absolute Pressure (MAP) sensor malfunction.
ECM malfunction.

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