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Home >> Buick >> 2000 >> Century Custom >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1639: 5-Volt Reference 2 Circuit >> Conditions For Running DTC

Conditions For Running DTC

WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The engine must be running.

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