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Home › Buick › 2006 › Rainier 4.2 S, AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System - 4.2L - DTC P0420 To P1682 › DTC P0442 › Repair Procedures

Repair Procedures

IMPORTANT: The Malfunction Indicator Lamp (MIL) may remain ON after the repair unless the DTCs are cleared.
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