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Home >> Buick >> 2003 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> P0130: Ho2S 1 Circuit Closed Loop Performance >> Test Description
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Test Description

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 2  - A normally functioning HO2S 1 voltage signal will fluctuate above and below the bias voltage amount.
  2. 6  - This step inspects the HO2S 1 signal circuits from the HO2S connector and the PCM connectors, including the low reference loop between the PCM connectors.
  3. 8  - This step inspects for correct HO2S 1 heater circuit operation up to the HO2S connector. The heater low control is controlled by the PCM. The engine must be running to enable the HO2S heater.
  4. 9  - The conditions listed in the test may contribute to the failure of the HO2S. The conditions listed apply only to this type of failure.

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