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Home >> GMC >> 2007 >> Envoy 4.2 S, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - DTC P0135 To DTC P0420 >> DTC P0418 >> Circuit/System Verification

Circuit/System Verification

Ignition ON, enable and disable the AIR pump with a scan tool while observing that the AIR pump relay operates.

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