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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.