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Home › Buick › 2009 › Allure Super › Repair and Diagnosis › Engine Performance › System › Engine Control System & Fuel System - 5.3L - DTC P0420 To DTC P3449 › DTC P0641 or P0651 › DTC Descriptors

DTC Descriptors

DTC P0641

5-Volt Reference 1 Circuit

DTC P0651

5-Volt Reference 2 Circuit

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