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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Engine Controls - 3.9L - DTC P0011 To P0420) >> DTC P0171 or P0172 >> Repair Verification

Repair Verification

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: After repairs, use the scan tool Fuel Trim Reset function in order to reset the Long Term Fuel Trim values.
  1. Install any components that have been removed or replaced during diagnosis.
  2. Perform any adjustments, programming or setup procedures that are required when a component or module is removed or replaced.
  3. Turn ON the ignition, with the engine OFF.
    4. IMPORTANT: DO NOT clear codes with the engine running. DTCs may reset in the same ignition cycle.
  4. Clear the DTCs.
  5. Turn OFF the ignition for 60 seconds.
  6. Start the engine.
  7. Duplicate the Conditions for Running the DTC and use Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.
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