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Home >> Buick >> 2000 >> Century Custom >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Controls - Self-Diagnostics) >> Drive Cycles >> Inspection/Maintenance Heated Oxygen Sensor Heater System Set Procedure >> Test Description

Test Description

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 numbers below refer to the step numbers in the diagnostic procedures.

  1. 1

    Make sure you perform the I/M System Check before performing this test. Failure to do so may result in difficulty updating the status to YES.

  2. 2

    Preprogramming the scan tool will reduce the amount of time the oxygen sensor heaters operate while verifying the enable criteria.

  3. 3

    This step is used to identify a first failure of a type "B" DTC. A DTC only appears on the I/M system Status display when it becomes a MIL illuminating DTC. This occurs on the second failure of a type "B" DTC. A first failure of a type "B" DTC will not allow the I/M system Status to update to YES. See DIAGNOSTIC AIDS .

  4. 4

    This step is used to help identify any unique or unusual criteria required to run the diagnostic test in the event the universal set procedure does not. This information is in Conditions for Running DTC.

  5. 5

    The I/M system Status only reports on whether or not a diagnostic has run, not the outcome of the test. If any emission related DTC sets after the tests are complete, the DTC will require diagnosis.
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